I believed lot of people has their format and formation of writing maybe to the regularities they do operate their account and if such person doesn't operates in those sequence then it's total out of original owner,....
I guessed you don`t consider revolution of Ai highly, the more data you can feed to that Ai with other instruction this is an easy feat for more upcoming Ai & their update, I hope you have heard of GPT 4o or seen those deep fake scams and others scams where Ai is the main tool use for.
maybe better still when leaving the forum for any reason such person could come make a kind of retiring statement or maybe if coming back in the future then theymos has to lock the account from his ends and when you wished to use the account you can hit him up to give you access back to avoid any further scam or hack from hackers.
Actually the option vapourminer is considering are those where by once the account is retired he can never get the account back even if he choose to return to the forum that means he has to create a new account to join next time.
@vapourminer I think even if you retire your account and can`t be given any access to the account when you choose to return to the forum again, which will make you have no choice than to create a new account, can also be used by the same Ai, creating an account and maybe having the similar name like vapourminer2, many may believe if the account as the same posting pattern as you except there`s signed a message this might be hard to detect.