I’ve viewed the one you’ve shared, that link profile. First thing i notice is the red negative trust on that account. So the DT members or the administrator himself have made they’re job done. If some newbies will still doing transactions with that account, it is not the forum or moderator has the problem but that newbies ignorance.

This forum is open to all and it means even to that scammy guy, so it is now our responsibility on our own to avoid them. The option of banning over and over again will not work because they can make a new account again and again. Giving them negative trust is the best thing to do.