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?
This is the fact. Now many bounties are full of shits and they give nothing to your hard work. But some are buonty managers who choose the right bounty and give a good opportunity. And many of their projects get success. You should find them.
And there are some buonty managers who give payment in BUSD or in USDT so you can join them if they have the reservation of the funds.