Every user of a centralized casino must prepare themselves to be willing to verify KYC when they ask you to complete KYC, because some casino regulations have stipulated ToS related to KYC even without the cause of your account log carrying out suspicious activities.
The main point is that you have to be prepared for the risk of KYC if you gamble at a centralized casino, some casinos will require KYC when withdrawing and I think it might be the best option to complete KYC on your gambling registration account because your account will not have problems with KYC.
It is now recommended to comply on the identity verification before playing. So you don't have to worry about this when the time comes that you need to withdraw a decent amount as your profit for playing. As I have said before, KYC is now common for centralized casinos since they're regulated. Therefore if you don't want to undergo KYC, then there's always an option to stay away and find a decentralized casinos wherein you can gamble anonymously.
Completing KYC verification before playing or making a deposit is only good if the gambler has chosen a reputable platform and has made up their mind that it will be the only or the main gambling platform for them and they will always use this platform for their activities because in such a case, the user wouldn't have to worry about KYC or anything later during their gambling journey unless the casino asks them to provide extra identification later on.
However, if a person is casually creating an account and they know that they don't stick to a single platform for a very long time, they shouldn't complete their identity verification if the casino doesn't ask them about it because some casinos will allow gamblers to play and withdraw without it if the amounts involved aren't significantly high.