The Casino.online team have extensive knowledge of working at online casino operators and we have never experienced any of them closing player casino accounts for winning. This sort of practice does happen in Sportsbetting where accounts are profiled and limited when winning on particular sports, but not at Casinos.
Ultimately the Casino is operating at an edge (check the payout rate of your online casino before you start playing) and the owners of these casinos know this. Winning is the main reason players will play at a casino so it’s very important winners are looked after and celebrated in the same way all customers are.