Most important: TRUSTED BOUNTY MANAGER:-
I couldn't agree more. This step is essential for choosing a good bounty project. You don't have to look anything else. Just make sure the bounty manager is trusted. If the bounty manager is good, he will make sure the bounty campaign is legit. And if the bounty campaign is legit, you have good chances of getting paid. Nowadays first thing I look is the manager. If the manager is no good, I just walk away. No point wasting your time on other aspects of the campaign if the manager can't be trusted.
i agree you will know if the project is legit or paying if the bounty manager is supportive and will help you when you have issue. But still depend of it the ICO is successful. I also joinen bounty campaign if there token are already listed on any exchanges.