Strictly not for everyone, bounties are for those who don't mind taking risks and they knew that this risk might be worth nothing after, how a project will perform and what a bounty hunter might earn from the project is unknown, it's all about taking risks, if you aren't ready to work for nothing bounties isn't for you.
I totally agree with what you are saying because Bounty is a job that has risks and it is never free from fraud that can sometimes occur and for those who understand the risks, it is definitely not a problem to follow it, but for those who are still complaining but still following the bounty, it means they do not understand the risks involved in the bounty itself.