Yeah, of course. I had accelerated my transaction to unban my "evil" IP.
I had set very low fee, but it(websites) done their job well.
No. You submited your transaction, the website did absolutely nothing and your transaction got included in the next block because there was space for it. Like Loyce said above,
many blocks are barely half full
You are too sure. Maybe it is not important now, when the BTC blockchain is unloaded with transactions. But in future, it is demanded very much. I did transaction to unban "evil" IP that was 2 satoshis per byte weight.
Nah... Again, I can say for
100% sure that from the links above, only ViaBTC's accelerator works. Either you paid because you are naive, or you are the scammer owner of the websites and want some users to scam (I hope it's the first option).
P.S: I see that all those services are claiming to have some kind of agreement with many Bitcoin pools but none of them will show any evidence. I remember that the last time a "transaction accelerator" claimed that and got famous,
bitkilo - who works for the Bitcoin.com mining pool - came to their post to explain they were lying.