Almost all of the Bounty right now is a scam, you will only know that it's a decent one until they give you your fair share for doing bounty with them. Before joining a bounty you will even if you do a research about the company and the project it will still not be enough to trust them to give you a share since most scam company now has a legit look over the companies overview and roadmap.
It's not safe to join a bounty program for your effort will be just for nothing.
Indeed. Even after researching the team and background of the project, it is still not enough to determine whether the project is legitimate. Some project are real but after not reaching their goal or the softcap, they all turn into scam projects.