Under the pressure of the QUEEN of the UNITED KINGDOM.
They have a sponsorship deal with Watford F.C -right?- they must be legitimate.. I thought that was obvious.
It says they are "owned and operated by mBet Soulutions NV" and "licensed and regulated by the Government of Curaçao".
It's in their ToS, you know...
I don't think the UK would give a damn about the government of Curaçao and their laws.
But these are only assumptions.
Maybe sportsbet.io are just assholes. That's a possibility too.