there are still some bounties that can make money even if not in large amounts and this is enough for everyone to earn additional income. So still want to forget about the bounty? even if I have expertise in finding bugs, I will never leave the bounty, at least I will get more profit, I'm greedy 
There are still bounties that are going or running, but we cannot say that it will always go through success. There are lots of bounties that are failing right now because some of the investors are finding their new way of earning through cryptocurrency, I might say that they are going in trading right now since it is really profitable especially at a time like this when the price of every cryptocurrency is surging up. Also maybe the reason why tether is on the top list on the market because that is being used as your primary money before trading. I think the problem is bounty hunter mostly sell all their coins/ tokens when the market open, and it was not the best price for the coins/ tokens.
Keep it for some period maybe will show their truly potential price.