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.
Well, i have already experience this strategy before and yes it will not guarantee that you are 100% safe to join a campaign because i join a campaign that manage by bounty managers with high reputation and experiences but in the end after spending 2 months with them they just declared that the campaign is a failure that the ICO is failed to communicate with them properly and that is why they are withdrawing from the campaign but the truth is we found out that the campaign is a scam.So i guess only the regulation can really help us to avoid these scam ICO and i don't know what is the reason but Amazix group is a fine bounty group for me.