I don't know what is btcmixer.io (?), but if you think about Bitmixer.io - It is the longest-running and most respected mixing service right now.
If you have any proof that this service scam anyone, please provide at least one example.

The difference is that your "service", are not able to provide even one example of a satisfied customer.

hehe I remember that about year ago website with exactly this same design was quite popular.
At the beginning they even pay out something to people, but after few days they stop withdrawals and everyone lost his deposit.
Of course, it's another attempt to suck BTC from newbies!