It's because they have a self-moderated thread and they have the power to delete the bad comments or some questions they can't even answer lol
And having a self-moderated thread for ANN is really suspicious at the very beginning, why do they have to make a thread like that if they have nothing to hide to anyone or in this community.
But of course accusing to someone/anyone needs strong proofs, and it's hard to determine if an ICO is legit if they looks good at the first place.
Topic moderation does not always equal scam. In almost every project, legit or not, there are tons of scam accusations with no real backup. Ethereum - scam, Stratis - scam, Everything - scam, etc. It is also a tool to FUD against the competition by using low rank cheap account. Nothing wrong with self-moderated threads, there are plenty of other social media channels without moderation.