Study the project as if though you're about to participate in the ICO. Know everything about the project and see if it's worth your time. If it's a high quality project it's always worth it.
It is the right way of choosing a bounty campaign because you are literally going to hunt those informations when you are reviewing a certain ICO,same factors,things should be check as ICOs are the ones who are getting paid these bounties,if the ICO has turned into a scam surely you are not going to get paid by these bounties which is why we need to be sure that we are getting into.