From what I see here, seems like majority of people saying bad things about sapien network are people that are not happy that they changed their bounty program rule towards the end of the bounty.

I have done a bit of research about them and everything seems legit to me, except that their team doesn't have a lot of experience. It also seems like they will be launching in April (saw the news in their telegram announcement channel).

It will be interesting to see how all this plays out.