I heard that some bounties fail to pay participants at the end of work. Considering this senerio, how can one know which bounty is a good to participate in?
A few years from now bounties were the good way to make money. but nowadays, mostly bounties have been a waste of time. but before participate any bounties firstly checkout about the manager is he trusted or not? then read their ANN thread. It can help you to know about the bounties.