There have been lots of bounties in the last few months in which bounty hunters did their job and invested their time in the campaign but they were not paid fairly or were not paid at all. This kind of incidents create negative trust about other projects too. So the question arises how can we be sure whether we are going to be paid or not?
it is a step by step process. First of all check about the project whether its legit or not. It its good then you need to find out who is managing their bounty campaigns and the rules of the bounty. There is a list of all the good bounty managers available online. if the bounty manager happens to be one of them then go ahead and earn some coins, there is nothing to worry about as good managers will not work for scam projects. If he is not in them, then you need to do some further research on the project and bounty manager and his previous record. If the bounty manager has got negative trust then do not waste your time on that bounty.
if there are any more suggestions, please let me know.