Stake seems to be a decent option to try and get into. Are you mainly sports betting or into casino games. I don't know why a provably fair casino would restrict access as they have the edge, irrespective of the wager amount. Maybe you play specific games that could be taken advantage of. Which is super rare but theoretically possible. Hence the restriction. To be honest, this happens in real casinos where you go gamble in person. A casino could ask you to leave or restrict your play, if you start winning consistently or are colluding with other players.