weaknesses will always remain. And players who try to exploit this will always stay, you can't do much about that. You can draw up a policy policy, and in combination with a kyc policy you can put a limit on a certain player, for example. That way it becomes much less interesting for a player to continue cheating.
Yes, but once such a player is limited in his cheating opportunities, he or she starts complaining about a particular casino This is the other side of the coin. Some gambling sites block withdrawals for such players and that very moment players start writing negative reviews about those websites.
As long as the casino can prove their case and can show that the one that is claiming to be scammed by them was in fact the one that was trying to scam them then there is no danger for them at all.
After all even if such people could take away a few clients from the casino it is not going to be a real problem for an established casino with a good reputation, even if their clients find about this as long as the explanation is public and everyone can verify they are on the right this may even help their reputation, by showing they treat complains against them seriously and give them a prompt resolution while also being fair about it.