Not necessarily suspicious but a New account. To be added if I'm not mistaken you need to have a +1 merit to your post to qualify.

The merit requirement was done away with.

Most of them are flagged because the posts do not show any consideration. Basically, it means their post doesn't show that they actually know what the project is about or what the airdrop is like. Of course, spammers and puppets have been similarly flagged.

If they posted something very general like "I like your distribution. I hope your project will succeed." etc which could be copied paste onto any thread and not look out of place, they get flagged.