I agree with members who, as one of the anti-spam measures point to "Report to moderator button", but one should not neglect also the available option called "self-moderated thread" which gives anyone who opens the thread the opportunity to be their own moderator.
Relates to self-moderation, I think users who have not yet thoroughly know about it should read the announcement of this feature from theymos, years ago:
Self-moderated topicsIn most sections, you now have the option of marking topics self-moderated when creating them. In self-moderated topics, the OP can delete replies. The option for enabling this is under "additional options". Topics cannot be converted to self-moderated topics after creation.
There are no rules to self-moderation. In self-moderated threads, replies belong to the OP. In other threads, replies belong to the respondents individually. Think carefully about whether you want to reply to a self-moderated topic, as your post may not be given due respect.
Tell me if there are any bugs. If this ends up not working out well, I might remove it.
Self-moderated topics? Can you say what boards this applies too? This is going to be bad if it is on certain boards, cause some people can edit threads to benefit them, I really hope it is just the off-topic board.
The excluded sections are Meta (except for this topic), Scam Accusations, Important Announcements, and Auctions. Tagged scammers can't use this feature. You don't have to participate in self-moderated topics if you're worried about manipulation by the OP.