Previously, I have never experienced losing the 2FA code but now I don't save Rollbit's secret 2FA code while the 2FA code is still active at the extension.
I really can not understand your post. How 2FA code can be active at an extension?
You must install that activation code to use and you can backup it somewhere, but on your extension, how? In addition, it is only an activation code and installation is necessary to have 2FA code for log in your account or withdrawal request for example.
If you don't backup your 2FA (activation) code properly, you will have risk of losing it and also troubles with your account in future.
Suppose we lose 2FA and our casino account has not KYC whether the KYC requested will still be approved with what is submitted?
But if what is submitted in the document will still be approved then that's good anyway.
When you lost access to your account and want to get it back, KYC is likely triggered and I think it is sensible requirement from any platform's compliance team. If they don't require KYC, scammers can easily take over accounts of victims.
unless you are legitimately at risk of anyone in the world giving a damn about your online footprint, or you have a lot of money sitting in your accounts (stupidity raises it's ugly head again because every T&C of casinos say they dont treat ur money as money, but effectively worthless tokens instead) , then 2FA is absolute overkill. A strong password combined with a reputable password manager, and a privacy focused email is all you need. 2FA only came about cus of people's stupidity. Literally.