aaaaaand .... again. No way to verify all bets as the data will come from the author itself.

About these off blockchain casinos, nothing will prevent site ops of making up magical bankroll or running away with investors fund.

Gamblers: you need (to develop) a browser plug in to check bets in a automated process.  Any rational gambler would check the code himself.

"Alleged" scammers (=casinos) count on the fact that you can't (manually) check tons of data (you're not even able to collect).