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Unfortunately there is no way to know from the beginning. You have to rely on the reputation of the manager, analyse information about the project and much more. Perhaps the service that collect statistics about the conducted bounty might be useful
You can read this article to avoid the bounty that you've join for are good or not.“7 Ways to Spot a Scam ICO” @bootstrappingme https://medium.com/@bootstrappingme/7-ways-to-spot-a-scam-ico-bb5d2d5eb286
There are many topics on this forum - how to choose a successful ico. But sometimes even they do not help and the project turns out to be a scam.