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...it's just that there isn't a viable solution to nip their actions in the bud without becoming a censored dictatorship....
...I support the idea of not allowing sales threads to be self moderated or locked...
The forum can't censorship. It would be difficult to draw a line.
But it can certainly do something, like what you mention here plus showing some kind of trust to non registered users. It has been suggested several times and always ignored. Even if it's mainly the scammed users' fault, anything possible should be done to reduce it. Besides the need to help those users, this just increases the bad reputation of bitcoin that links it with illegal activities.