If you're a legit bounty hunter and you're receiving shitcoins for the last two years, where do you think you'll go of course you'll stop doing bounty and will look for a real job or set up a small business however small it is unless you are doing it as a hobby, but if you expect to profit, you'll be disappointed, it's not as good as before, its like a lottery now and those who remain are like what you said multiple accounts and bots.
the rate of fraud projects and scams are really that rampant which if you are a bounty hunter then high likely that you would really be able to deal with these things.
Bounties isnt really that dead since i could still see projects who do continue to make out some ICO and surprisingly there are still people who do make join of these bounties
but of course you cant remove those bots etc.