In my opinion they are good for the environment of the forum. Filling up the gap left by the admins and mods. So if anyone should be tagged red here are these who do little to nothing to retrieve locked-hacked accounts.
No one is going to argue that it is fair to wait months to retrieve an account.
I disagree they are doing good for the environment because anyone is free to go and make a new account while they wait on the original. While there is no rule against the buying and selling of accounts, I feel it is fraudulent to use bought accounts. They are pretending they are "someone" else, and the red tag signifies that. Other than making people look a little closer it doesn't have any other effect on how you use the forum.
Luckily with the trust system in place you are free to tag anyone you feel isn't doing their part to return your account to you.