Of course not, and for me it is usable as part time of job. Currently source of earning money from bounty is very low level so you can't earn 500$ here even working from 10-15 bounties. But you might get more money than that for some project's sudden hype. Last year i did some bounty work since then i don't work on bounty anymore. But i am working on signature campaign from btt form, which is the best online income for me. But this cannot be the only source of earning money so it is important to have a job or business as an alternative.
Exactly, signature campaign like bounty shouldn't be treated as a full time job. We all know that they are not going to be permanent, although there are long running campaign, but the company could stop it right away without us knowing it.
That's why bounty hunting is a hit or miss, you might be lucky to get some airdrop or payment and the token being listed in a good exchange and make the price high, but there are bounties that are totally worthless and not deserve of our time.