In order to avoid bounty scams you need to consider 2 things:
1. CHECK THE PROJECT - you need to do research about the bounty, the project team, the whitepaper because some might just copy and paste it, the advisors, roadmap, bounty pool and ofcourse the founder you need to be a good observer, check their background because sometimes by just merely observing and reading you will know right away if the bounty is a scam.
2. CAMPAIGN MANAGER - the one that you should always consider, because if the bounty manager is scammer then the bounties itself is a scam, and it is really obvious if the bounty manager has a negative trust then surely he or she is scammer, one thing to consider also is the rank of the bounty manager the higher the rank the higher the legit factor, you can always do research here there are many list of legit and reliable bounty manager and the list of all bounty manager scammers.
thank you for your kindness!
hope it helps!
more power!
I agree with your number two(2) advice, whenever have a new open bounty or signature campaign I always recognize who is the campaign manager so I know if it's nice to join, I have a favorite manager and I always join his signature campaigns every time he opens a new one.
And for those who are just beginning and willing to join the signature campaign I recommend that you read this thread first for more information.
When you participate in bounty manager is actually matters. If the project actually using the newbie guys they are promoting the project with the own people. Those kind of the bounties are actually scamming the participants by only getting the promotion and they get the crowdfunding mate.
I see this thread bumping with the same answer and agreeing it the same. Instead of that we can add the more information needed to be here or let this thread dead forever guys.