Maybe those kind of posts needs to be only in the scam accusation section so posting this kind of post in their ANN or bounty thread might be considered as off topic comments.
But I saw marlboroza warned some of the bounty threads by posting these kind of comments those also got deleted?
It happened only one time, mprep explained it:
Warning users that a project is a scam is not off-topic. Posting the same thing to several threads might be considered multi-posting / duplicate posting (especially if the threads said duplicate posts were posted in are about the same project).
So it must be it
Or maybe, proof that any of these projects is scam isn't solid and/or it doesn't exist, perhaps one project didn't collect any money so this will make it "fail ICO", and they launched another ICO with different idea? There is huge difference between exit scam and fail ICO.
If that was the case, maybe post was reported as spam?