I want to get a clear scenario from you theymos, if email is been ban or got disabled and the user of the bitcointalk account have not noticed for long period that his email is not in function and a hacker has penetrate to his bitcointalk account and succeeded hacking the user account, can the person retrieve it's account through the management of the forum while it has not sign a message with its receiving address of the first earn for the forum??
I don't think something like that is going to happen. But you have a solution for a case like this. If you ever posted a Bitcoin or Ethereum address from where you could sign a message to prove that it's you, then there is a chance that you might get back your account. My account was locked back in 2018 because I was adding security questions and changed my password. Later, my account was blocked. Luckily, I had posted one of my Ethereum wallet addresses from where I was able to sign a message and the mod hilariousandco unlocked my account. I am sure they would recover your account if you could prove that you are the owner.