I consider Kelta(KLT) a scam too! They scammed their bounty participants, despite raising a whopping amount of $37M, the last page of their bounty thread you will see some participants whining about their reward, their spreadsheet wasn't updated, while the OP starter was last seen on May 18, and their telegram group is inaccessible.
Good thing I didn't join any cloud mining ICO bounties, those participants wasted their time! They should've learned their lesson by now.