Since the data protection people stopped us from publishing the details of known scammers, we are somewhat helpless to stop them.
One considerable help would be a conversation monitor which creates an alert for selected mods/admin when specified key word(s)/phrases are sent in a conversation.
E.g. A match on at least one key word or phrase (maybe a Person's name, phone number, bank account number, street name or post code) sent in a conversation creates an alert with a particular message pointing to a thread or previous user profile.
We could then step in to ban the scammer and warn the intended new target.