Try to research in IcoBench or Icorating before joining in any bounty. This would give you successful bounties.
+1 on this. I also research what bounties i should join on ico bench! I also base my bounties on bounty managers, some managers can be trusted in regards on how they distribute the stakes as well as the tokens. Also, the campaigns they accept would probably be trusted since they're holding on to their reputation.
Before i do believe on this rating sites but now i dont know anymore.
There are more paid retings and turned out to be a scam. if you pay good then they will give you good one.
If not then you will suffer. the best thing to do is to research the bounty and before joining you need to study it.
Do your own research and rate the project if it is good then join!