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?
Even a top manager have their own failed project, so technically we can’t tell aside from the manager being escrowed the total budget of the bounty. There’s a lot of campaign already that is being escrowed, you can participate on that and do the job. Again, better to have your own analysis as well so you can know if that project is worth your time, some bounties are still paying good money here just have more patience.
Bounty enrollment is a game of chance and that means it involves luck. About escrowing of the rewards this does not matter anymore because a coin in your wallet when distributed but it is not in exchange, then it is waste of effort when it is not listed. Also some team luck up the coins for a long time and you can't sell even you having the coin in your wallet. It is luck but better to participate with reputable manager and coins escrowed because you can be lucky as I said. A bounty that will scam partipants will eventually do scam.