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=0ico rating site is not guarante ico campaign and bounty campaign are legit even the ranking is high, but we can minimize the risk for not joining in campaign with low rate