Typically casino will allow withdrawal of your deposit before they ban your account. Seems like you commit violation of their ToS which is related to sportsbook. Probably you are involved with arbitrage bet and other techniques which the casino deemed not allowed to use in the casino.
Chips.gg is an established casino and well known in the forum. I doubt that they will do a selective scam by using fake accusations of ToS violation just to hold your balance.
Hello,
I don't do "arbitrage betting" but similar casinos using the same sportsbook provider (betby) are also throwing accusations and banning/reducing my stake me for "value betting" which is a ridiculous accusation, basically implying if I beat their sportsbook I'm breaking ToS.