Not a scam at all, completely legitimate project. I've been holding COSS tokens for almost 2 years now and they haven't missed a single day of dividend payout.
I am also once Coss token holder, it was got from coss bounty campaign after that i invest some amount also in Coss token, and using their exchange without any issue from past 2 years. So I am sure that the Coss token will give good return in coming days.