That's why they're paying you in tokens and that's why these shitcoins exist.
Unless that the bounty is from a seemingly long-running corporation for more than 50 years and managed to join crypto in here and maybe there's slight of a chance they'll pay in those but who would ever do that.
As for me, I have joined a bounty that pays USDT for their participants and it works well. However, I only participated for one time and I didn't get a chance to participate in another one because they didn't offer that kind of bounty anymore nowadays. I also discovered when they offer those kinds of bounties the payment is not that promising but it's fine for me because you can expect you gonna be paid for your hard works. especially when the managers are proven, go ahead and join that will be no doubt a sure good bounty for you.
They have not disappeared,,, some of the longest running campaigns have always paid in Bitcoin and maybe these are in small amounts so they were never really so popular but as the shitcoin token bounties got closer and closer to zero people realized they were good in the long term.
Keep looking for projects that are real and you support, then you never go hunting around for projects that disappear after a few weeks.