As a huge number of posts including numerous links are being posted every day in the forum, you are right. There's a high probability that the forum is being used for backlinks and SEO.
But since the post you referred to has been made about 9 months ago, we cannot say that service is definitely behind the current spam going on.

That's planned and will be possible in future.
Click here to read the post already made by TryNinja.

I can do this at Coingecko's rate (19 satoshi, when I am making this post).

I will deduct the transaction fee.
If you are not in hurry, I can set the fee at 1 sat/vbyte (It will cost you about 150 satoshi)

I think you are trusted enough and I can go first. PM me your BTC address, if the offer is accepted.

Update:
I sent BTC to Zwei and received DOGE very fast.

According to modlog, that post had been made by jorenabanu19.



Your scrapper failed to scrap the user ID of the poster, probably because it was deleted so fast.

If you have imported your wallet using a single private key, your wallet includes a single address now. If you send any amount less than your total balance, your transaction will have two outputs. The first output will be the address which you are trying to send the fund to and the second output will be your own address. In other words, the change address will be same as the sending address.
So, the remaining balance will be in the address which you are sending the fund from and its private key is the only thing you will need to access your fund.

You may lose your fund if you don't specify a change address.
As you are using electrum, there is nothing to worry about. Electrum will consider the sending address (or one of imported addresses, if there are more than one imported address) as the change address.

The thing you should pay attention to now is that, by sending a partial amount and sending the remaining balance to the sending address, you may damage your privacy.

You can send any amount you want.
If you have imported a seed phrase, now you have a HD wallet and electrum will send the remaining balance to your change address.
If you have imported a single private key, electrum will send the remaining balance to the sending address (the address you imported using your private key)
In both cases, the remaining balance will be in your wallet and you will have full control over that.

The minimum fee you can pay for your withdrawal is 250 satoshi. (Look at the image below.)



The transaction they make for your withdrawal always includes one legacy input and two outputs. Therefore, the transaction size would be 225 byte (=225 vbyte).
If you pay the minimum fee (250 satoshi), it leads to 1.11 sat/vbyte.

Whether the wallet has the private key or it's watch-only, you won't get the transaction hash if you don't finalize the transaction. Most probably, the OP hasn't finalized the transaction.

My guess: 560

My bet
My tweet

My guess: 77

My bet
My tweet

entebah is right.
The problem is that even if you pay a high fee while there is an unconfirmed parent (a withdrawal made by another user), your transaction wouldn't be as fast as it should be.

Assume that user A makes a withdrawal and pays 1 sat/vbyte as transaction fee. betBTC send the requested amount to user A and send the remaining balance of their wallet to their change address. After that, user B makes a withdrawal and pays 100 sat/vbyte as transaction fee.
The user B has payed much higher fee to have a fast transaction while there's an unconfirmed parent which is out of his control. As long as the transaction made by user A is unconfirmed, the transaction made by user B cannot be confirmed.
User B is actually implementing CPFP (Child Pays for Parents) method for user A and when it comes to transactions priority, both transactions made by user A and user B are like a transaction in which 50.5 sat/vbyte has been paid as transaction fee while user A has paid 1 sat/byte (about 250 satoshi) and user B has paid 100 sat/vbyte (about 25000 satoshi).
This can be much worse, if there are more unconfirmed parents.

I think the OP canceled the first transaction (replaced the first transaction with a new one to himself) and then make a new transaction to a new address. He repeated this one more time.
And this is probably why there are 4 unconfirmed transactions in the image posted by him.

1.  Everton FC vs. Arsenal FC - 2
2.  Newcastle United FC vs. Fulham FC - 1
3.  Tottenham Hotspur FC vs. Leicester City FC - X
4.  West Bromwich Albion vs. Aston Villa FC - 2

5.  CA Osasuna vs. Villarreal CF - 2
6.  Levante UD vs. Real Sociedad - 2
7.  Granada CF vs. Real Betis Balompie - X

8.  FSV Mainz 05 vs. Werder Bremen - 2
9.  Bayer 04 Leverkusen vs. FC Bayern Munich - 2
10. VfL Wolfsburg vs. VfB Stuttgart - 1

11. Torino FC vs. Bologna FC 1909 - X
12. Atalanta BC vs. AS Roma - X
13. SS Lazio vs. SSC Napoli - 2

14. RC Strasbourg vs. FC Girondins Bordeaux - 1
15. FC Lorient vs. Stade Rennais FC - 2

Betnomi username: hosseinimr93

Bonus game:
16. FC Schalke 04 vs. DSC Arminia Bielefeld - 1

When you cancel your transaction in electrum, actually you make a new transaction to yourself.
Most probably, the transaction you made to yourself (for canceling the first one) hasn't been confirmed and your new transaction has unconfirmed parent.
 
No need to cancel the transaction.
If you are in hurry, increase the fee. Otherwise, just wait. Your transaction will finally be confirmed.

Joel_Jantsen, nutildah, suchmoon thanks for your responses. You all are right. I agree with you. There is no evidence and we cannot accuse users above.

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No they don't.

Even before making this topic, I expected these responses. I know that there is no evidence.
TBH, I wanted to post this topic 2-3 days ago. But I didn't, because there was no evidence of abuse and even now there isn't.

Today, I checked the account in question again and saw that a same thing is happening again and again.
Even until the last moment before posting this topic, I was hesitant about making this topic.

If you check the merit history of bitcoinermatt, you will see that he has sent merit to 6 users in 9 merit transactions.
All those 6 users has sent back merit to bitcoinermatt immediately after they received merit from him.  
You are right that some newbies think that merit is something like "thank you". But it's a bit suspicious, if you merit 6 users and all of them think in that way and merit you once you merit them.

Please take a look at merits sent and received by bitcoinermatt.

bitcoinermatt sent 2 merit to Grafftz.
Once Grafftz received the second merit and his first smerit, he sent back a merit to bitcoinermatt.

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bitcoinermatt sent 3 merit to mr_ROBOTT and 26 minutes later received 3 merit from him.

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bitcoinermatt sent 5 merit to hossamdz and 2 minutes later received 5 merit from him.

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bitcoinermatt received 10 merit from mrob82. About 1 hour later, sent 8 merit to him and 6 minutes later received 4 more merit from him.

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bitcoinermatt sent 3 merit to Sparrow96 and about 4 hours later received 3 merit from him.

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Again bitcoinermatt and hossamdz.

In less than 10 minutes, bitcoinermatt sent 7 merit to hossamdz in 3 merit transactions and received 10 merit from him in 4 merit transactions.

Don't use it or you will likely lose your coins.
Read following topics. 

Vulnerability discovered on bitcoinpaperwallet[.]com - DO NOT USE IT
Why has my newly created Bitcoin address already been used?

If you have 11 words, for finding a valid 12th word, you have to brute-force it. Because for 12th word, you need the checksum and for computing the checksum, you need the first 7 bits of the 12th word as well.

It's not a good idea to select 11 words and find a valid 12th word. The best method is to select the first 128 bits (preferably using a dice), calculate the checksum and then find corresponding words.  

First of all, note that transaction are prioritized base on the fee you per vbyte not the fee per byte.  
Assuming all inputs of your transaction are legacy addresses and the fee per byte is equal to fee per vbyte, your transaction is now about 26 MB from the tip and currently there are more than 50,000 unconfirmed transactions with higher priority than yours.
According to the estimation made by mempool.space, even for getting the first confirmation in 42 blocks (about 7 hours), you need to pay 70 satoshi per vbyte.

As you stated that you are not in hurry, just wait. In the worst case, your transaction will be confirmed on weekends.

You get only 50% of the base prize (currently, 50% of 10 satoshi)