The Bounty Campaign is a unique form of promotion of new projects for the industry.
Since the project has not yet attracted any investment at an early stage, the team launches a Bounty Campaign - a social activity campaign with rewards in tokens/coins of the project, which are not yet worth anything, but as soon as the fundraising begins, tokens will acquire real value. So they are definitely useful for new crypto projects, but they might be not same useful for bounty hunters, lot of projects are either fail or scam people.
If you choose projects and campaigns wisely, as well as observe the conditions you can earn good money, but to live solely on such earnings seems difficult to me.