To choose a bounty campaign, I advise you to look at the status of the manager on this forum. The higher the status, the more reliable. This does not give a 100% guarantee, but most of the scams come from managers with the status of Newbie.
See the ICO rating on sites such as ICOBench and others. Do not join companies with a rating below 60% (3.5 on ICOBench).
Do not join the company from any managers from Amazix.
P.S. In choosing a bounty, this free table can help you:
https://docs.google.com/spreadsheets/d/19fLkDCH0E4uOrYlgqAVixmCIOGupLl8cLRlwttvXsT8/edit#gid=0I totally agree with this suggestion because if the manager has a very good record with success of bounty he has managed, it shows that he wouldn't go and settle with bounty that is not potential because his fame is will be at risk and also icos with good ratings also shows the project is a good one and if you can also do a very good research based on your experience, you can be able to choose a potential one even as it is not 100% guarantee.