[1]Why are there so many scam bounties out there and [2]how are we to know which is scam or not
[1] Because there are many newbies that can easily be scammed by these scammers.
[2] Its difficult to know which are the scam and not but here are some of clues. If the project is cloud mining and lending platform thats an obvious scam.
agree. you make good points here.
we know it's hard to find out which one is true paying bounty, but we can always avoid this type of platform.