1- Sportsbet state in their ToS:
12. BONUS RULES
12.1...
Honestly, I do not even care about these bonuses.
Occasionally, I used one of those boosters on a small bet and only because it was popping up on my slip all the time, otherwise, I would not even bother.
Therefore, these ToS do not apply on my case at all.
"Perfect" sportsbook would be non custodial. Where the book never has possession of your funds.
Check Degens.com as it uses smart contracts that are audited. It's 100% KYC free. So there is no 'multi account' issues. And nobody at Degens can touch your money.
Centralized sportsbooks won't exist for long IMO. Non custodial, decentralized books fixes all the dozens of problems cited about sportbet etc.