If an account has been deactivated because it has been inactive for a long time and, prior to deactivation, the account was an active player who played honestly at a particular casino, the casino will consider deactivating the account even though it has not been active recently. This may fall under the exception category.
However, if an account is deactivated because it has been inactive for a long time and there is no history of deposit or withdrawal activity indicating that the account was active, I believe that if I were part of the team at a particular casino, I would also support the decision to deactivate such an account.
I think the rules should remain same for everyone regardless of the history of the players. Consistency in the rules should be followed and expectation should be used as minimal under unavoidable circumstances.
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.