Exactly it is not only about if they accept to accelerate your transaction but how fast can they do that and that’s where you see the ViaBTC accelerator been advised as most reliable because last time I check they have the 3rd largest hash power and at least in a 100 minutes they could get lucky to mine one of the blocks and that is explains why they also have limited number and time restrictions for the free services.
Viabtc had a nearly constant share of the pie for the hashrate for years , they decided to limit the numbers of free tx because of $. nothing else
Average fee at 10$ and you offer 100 free spots getting just 2$ back, that's $800 lost an hour , $20k in a day, not the recipe for a profitable business, especially with earning so low on mining.
Viabtc hasn't worked well for a long time(since last I tried it).
Viabtc works perfectly!
There's also this free transaction acceleration service provided by a member of the forum and as far as I know, they've been working for long and still functional. So you might try they out if you have another stuck transaction
FREE/PAY BITCOIN TRANSACTION ACCELERATORHe hasn't accelerated a single tx that wouldn't have been confirmed anyhow!
You can check the tx "added" yourself, they are always on the min fee for the block.
7a9845060e1a8dd0fde24c6f0bfc3b13aecd7383bb5cadb489110c9e0b46dd49
Mining ViaBTC
Expected in Block