In the spirit of transparency and community safety, I am proposing a Bitcoin Address Verifier tool built specifically for BitcoinTalk Forum users.
Let me explain in detail the workings and how the functionality is to be.
I read through your proposal and dislike it.
Forum is for freedom but also privacy and anonymity. Your proposal destroys many purposes of the forum in privacy and anonymity.
Users have to be responsible for their decisions when posting their addresses in the forum, but it doesn't mean the forum needs to mark all forum members' addresses with labels/ tags that as said lead to nothing good for privacy and anonymity.