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Actually, problems like this are not new anymore but maybe their numbers are rampant now because crypto and fiat casinos online are growing faster. Creating multi account's are a basic way to take advantage of the bonus but I doubt those who attempt will be successful. Before they can think of it, the casino already knows this and have prepared different measures to combat the issue.
If you are sure to your self that you are gambling in a fair manner then there is no need to worry about this problem. You won't be affected with it and you can always withdraw your bonuses once you won them. The main reason why someone can abuse the bonus is because they can't afford to play using their own money.
If a gambler takes an action that violates casino rules by creating multiple accounts to take advantage of existing bonuses then it is natural for casinos to give sanctions by freezing accounts but at least casinos can solve problems like that properly where they still provide opportunities for gamblers to be able to take the amount of money deposited.
But all forms of sanctions and policies are a full right that is owned by the casino so gamblers cannot change them.
Regarding the problems that occur, I believe that the casino can provide the best for the solution.
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That is just the way scammers operate, we know that clearing the wager requirements of a bonus is not easy and when we do we feel a small sense of achievement, but scammers instead see nothing more but a window of opportunity, they think that if they can create enough accounts then chances are that some of them will clear the waging requirements and this could allow them to be profitable.
However this is a losing battle as casinos are getting better at detecting multiple accounts and all their efforts will be in vain.
Right, friend, now the casino has many ways to be able to detect any fraudulent actions carried out by gamblers so that if a sanction is given, the casino can immediately carry out a settlement and of course the casino can provide evidence and clarity in every problem that occurs.