It's normal for them to be scammers. They still send me invitations to play, even though they stole my bonus winnings and even my deposit (which is unacceptable, and no self-respecting bookmaker would do this).
Sportbet.one is a shitty, moneyless bookmaker run by kids who live in their parents' basements.
These bastards accuse me of arbitrage or bonus fraud in every situation. Just check their reviews online; everything is clear. It always concerns the same case, and their verdict, unsupported by evidence, etc., is always final. This seems to give them the right to steal players' balances.
They should have been jailed long ago, but since they're an offshore bookmaker with a worthless license, they can still steal deposits.