Fraud on the bitcointalk forum is not moderated, so the moderator cannot delete the topic, as the rules of the forum have not been violated. Sometimes it happens that scammers leave referral links, in which case the moderator has the right to delete the topic because the rules of the forum have been violated.
There are times they are deleted also, while some will remain unhandlled. This one was marked bad for me which is the second strange one I notice between last month and this month. I will go and also contribute on the thread. 200% return is obviously not possible in any business. It is a scam.
I do not see deleting scam as a violation of any rule by the moderators as we do not know the rules theymos gave them. Although, we still always say that moderators can not be 100% perfect but this is not one of the case because of I only see scam not moderated for no one to come and take the forum responsible for someone that scammed them.
There are many that I have reported before that got deleted. Especially the crypto recovery scam topics and some other ones.