So I think it's unlikely that casinos will limit the number of losses of gamblers while profits are the top priority, on the other hand I have never experienced the incident described by the OP because I have never had such a big win, but certainly limiting the number of winnings of gamblers yes maybe it can be done by casinos because there are no other options to avoid bankruptcy, but yes anyway I would say that the casino is irresponsible.
This is not the first time this kind of issue has been raised here; sometimes around last year, a newbie created a topic where he was asking for a casino where he can freely stake a huge amount without being limited in the amount he wants to stake. He was complaining about a casino that he has been using for more than three years, but they later started to limit the amount he could stake at once, which was not cool with him.
He didn't really explain what led to his staking amount being limited, but from what I understand and since he was a sports bettor, I feel he must have really been winning too much and the casino decided to limit his staking amount.
Casino games usually have a higher chance of making gamblers lose their money, and the casino owners are aware that they have a higher percentage of winning in each game, so when they see that a gambler is winning continuously on that game, they will probably see it as something that is quite abnormal.