Casinos, at least in the US, are heavily regulated. All games are checked for fairness; there are minimum payout odds mandated by law (for example, slot machines in NJ must return 75% or more, depending on locality); casinos must keep cash on hand to cover payouts; they must pay immediately on demand; etc. In addition, they're liable if they allow clearly-addicted people to continue playing or if they explicitly encourage unhealthy behavior (although this is loose, as they can ply you with "free" rooms, drinks, transportation, entertainment, etc.). It's not even the same ballpark as these apps run by criminal organizations that have no rules. Banks ought to block any payment to them and cut off the source.