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The thing that bounty hunters can do is to do a good and thorough analysis to find out whether the bounty is good or not and can produce or not. Following a bounty managed by experienced senior managers may be a safe choice, but must continue to do research before following it.
by choosing a trusted bounty manager, with a good reputation, and having a lot of experience handling successful bounties is indeed an effective choice. The bounty manager will definitely be careful to accept cooperation and have done in-depth analysis beforehand, to maintain his reputation.
in addition, choosing a bounty campaign with btc or eth rewards can also be a good choice. Recent trends also show that some projects prefer to give btc and eth rewards. this becomes a pretty good one. like the injective protocol.
The reason you are not to put your whole reliance on bounty managers, irrespective of how professional or trustworthy they might be is because they are also humans, who can make mistakes. Sometimes, they also issue out warning that they are not part of the team and that participants should also do their own research before joining.