If the casino inactive the accounts if it is not logged in for certain period, they should follow the same rules for everyone. If some is a part of the casino team, he should be active and if not, the account should be deactivate. Also it is a good practice to disable the inactive accounts for security reasons. It helps in avoiding situation where someone hacks an inactive account and maybe misuse it in some context.
If the owner can easily reactivate it, this is a good option.
A better method would be to force the users to create a strong password, so it becomes very unlikely that anyone would be able to hack any account by bruteforcing it
Will an account that has not been opened for a long time be deactivated? Will there be a notification via email at the beginning? Usually, yes.
This is how it should be, where account owners must have strong passwords or disable 2FA so that their accounts cannot be easily hacked.
2FA is the safest way to secure casino accounts because almost all casinos now have 2FA features.