why will they be asking for someone passports and picture what that for i think they should request for another thing
If you are talking about bounties, they are requiring KYC to prevent multiple accounts joining a campaign. As for trading exchanges, they need it because they have to follow the strict KYC/AML protocol which is universal I think. This is a way what they call regulations. I don't see any issues if this is for trading exchanges. because if you don't comply then it will be very difficult to withdraw specially if it involves big amount.
What I don't like it though is bounties asking for it, because there was one ICO KYC leakage. And once its proliferated in the dark market, I'm sure that criminals will exploit them for their illegal activity and purpose. So just beware about submitting it in exchange for a few dollars.