I have had Coinbase close my account years ago after sending funds for promotions, not 100% directly related to casino's but close enough to possibly shut it down. The only explanation I was given was breaking of terms, and was directed to take my funds out. I even followed up a year later and was not able to get an answer. Not sure if they knew my business or if it was by sending to some known address?
The main question I am getting to is this, I am writing a guide for my users to begin using crypto, last thing I want to do is have them use an exchange, get setup and have it closed. I would recommend using a local wallet of some type for dealing with casinos but I am interested if others have had Coinbase or other wallets close accounts because of gaming before I make suggestions to my gamblers.