At this moment the best coin which is distributed by airdrop system is DeepOnion coin I think.
It has real and usable product which is easy competes with Monero and Dash and it has many more features such as DeepVault
which in short words let you check if some of your important files has been modified.
So if you want to be rich in the future join deeponion community and you will see why I am serious about it.

You can ask here: https://deeponion.org/community/threads/banned-rejected-apply-for-re-review-here-thread-open.2638/
Though I am not sure how it is with Slack now as there were some issues with it.

Well I checked your posts history there. You have tons of posts but very few of them could be considered as high quality posts.
It already happened to somebody - he was accepted but as there was posts check on friday he was disqualified of the airdrop because of his non-quality posts.
I counted 10-11 'quality' posts. Well it's in quotes because they aren't one liners but some of them are questionable and if someone who checked them
though it's not quality post he didn't count it.
(Just my opinion - I might be wrong)

Well your bitcointalk membership level is just Newbie.
You need to be at least Jr. Member to be able to add signature to your profile

You probably can try to apply next week but I don't recommend it to you. Take some time before re-applying because there might not be a 3rd
chance to apply for you if you will be declined again.
Probably the reason for your application being declined is that you didn't have enough quality posts (this is not necessarily the only reason) as I can see you made 11 posts this week (10 if I don't count the last one I'm currently referring to).
Be more active there, make quality content and it would also be great if you are active on DO forum (not mandatory but the team can see you support this community and it might help you get in the airdrop in the future).

Unfortunately your BCT account was registered after 1st of September thus you are not qualified for the airdrop.
But join DO forum and be active as much as you can and you will soon or later be rewarded for you hard work.
Create some interesting thread, tutorial, articles on steemit, blogger, wherever you want and whatever you want you think can help the community.  

Keep working hard! But I think it will take more than just 1 week to get successfully accepted
to the airdrop as there are rules to get qualified. Don't rush and take your time the airdrop count didn't even hit the half!
If you are too impatient and you try to join the airdrop without enough quality posts / week you might regret your decision as
you could be blacklisted / rejected.
Just take your time.  

Well. At first as you can see at this thread's number of pages there are over 1300+ pages which is absolutely unbelievable
when you consider that this thread exists just 3 months!
This coin's features are amazing such as DeepVault which will be implemented very soon, sending anonymous messages and the coin itself's anonymity etc.
And of course the community makes this coin so great. If you look on the forum there are lots of tutorials, contest, giveaways made by its users and moderators so everyone who
joins can participate and help the community.
All of these things makes this coins so great but also important is the airdrop everyone's trying to participate in - this is the reward for all the hard work users and moderators do.

You must be online and be active that means react to posts but not spam as for example 3 words posts are often considered as a spam
and are being deleted by moderators. To reach Jr. member you must have at least 30 posts but also be online and active. If I remember right or if it
wasn't changed you can get maximum of 14 activity in 14 days but I don't exactly know how this works.
Just be active and your activity will grow.

Also to participate in the DO's airdrop your BCT account must be registered before 1st of September but I believe that they will push the limit in the future.
You can try to join airdrop but you just will be blacklisted so don't even try 'till the limits are pushed.

I am not sure but if you register on https://www.coinexchange.io I think you are okay.
You do not need to enter any personal details, ID number, tax number or anything like that.
All you have to do is just register using your email, that's all.
Sorry if it is not like but I am almost sure it is.

Well it is hard to say especially when I put a lot of effort in translating but as there is not much
activity on this thread I am afraid that this project will not be successful and even will not be launched.
I guess this project is forgotten as there are many starting projects and ICO's and even they has many posts and activity
on their thread but this project is announced for quite a long time but only has 3 pages.
It kinda makes me sad :/.

There is no secret my friend. This project growth so huge and won't stop because of amazing developers, moderators and of course the community.
All of these people makes this possible because we believe in this innovative project my friend.
Come and join us if you didn't already.

There is no chance that they disappeared from your eth wallet without spending them.
Check your balance here: https://etherscan.io/ (just paste your eth wallet in search field).
If they are there then you just need to add custom token to your MEW wallet again. I think this is the solution to your problem because when you add custom token to your wallet displaying of that token is just saved in your browser. 

Hello mate. Try this post on deeponion forum.
It should be what you are looking for. https://deeponion.org/community/threads/wallet-backup-restore-private-keys.3442/#post-50590

If this doesn't work for you try to search on forum I'm sure there will be more information.  

HODL - It all started there https://bitcointalk.org/index.php?topic=375643.0 

Hello mate! I had the same issue. Even after requesting new confirmation mail (about 5 times) still no mail arrived.
I don't know what your registration email address is but it seems that server has some issues sending to less known email providers.
I'd recommend either join slack or change your email address in your DeepOnion account (the second option is much faster).
For 2nd option just change your email address here: https://deeponion.org/community/account/contact-details
I used gmail as contact address and it arrived immediately.
Let us know if it helped you.

EDIT: I forgot to mention that I was waiting 2 weeks and nothing arrived.

I received beta code at 5th of September and as promised the platform really works and is working. Though it's still beta test it works well and without doubts will work better in future.

The best community so far which I came across with  
This is so nice and hyped community it's sometimes hard to believe.
Btw. Hello. I'm Spexik from Czech section on DO

All investors (I'm 99% sure) received their tokens as their distribution was priority above all.
However if there was somebody who didn't receive them they just needed to contact support. Investors were dealt individually and if there was any problem with sending their coins they tried sending the payment until it got through the network. 

I feel so sorry for you @thang long.
I can imagine the situation you were in. This shit can really happen to anyone there you have your responsibilities and I think your decision was right.
I'm not afraid to say justifiable (if of course what you said is true but noone but you can prove that ) but rules are rules man.