Aside from being caught and freeze all the account. I think it’s useless because casino welcome bonus often have a high wagering requirements which is extremely hard to complete.
You can add the max win on the bonus set by some casino as extra hurdle to avoid being abused the bonus by multiple account users.
Casino is prepared on worst case scenario.
Exactly, play reasonably, deposit reasonably, and don't target bonuses for us to use, it will become better options for us to stay playing with save. Because, if we are not a gambler with a lot of money, there's no reason in chasing these bonuses. We might feel this is unfair, but almost all bonus models come with "terms and conditions." If we feel can't meet the TnC, just let it go. Even if we are losing that bonuses, it's not a loss for us.