I took a quick look at "FireDAO", and it's not something I want to support. It's another BS ponzi scam with "ape pictures".
I had seen this user creating a lot of threads like a month ago? If I can recall correctly, s/he also has an alt account and this could be the main. I already saw a lot of threads from them discussing about the usual stuff like getting people interested into their project.
Your question shows that you are interested in bounty hunters specifically. What I can say is that you can offer participation to members with a certain amount of merit, thereby limiting the number of bots that will spam the forum. In fact, there are a lot of cheaters who are engaged in bounties, and if you need to advertise the project on social networks, then rejecting newcomers who do not have merit will be the best choice.
As far as subscription companies are concerned, most of the users will participate in payment in BTC, and it seems to me that if you want good posters, then the payment for posts should be decent.
Considering how bad bounties became since 2017 and ICO years, I am not surprised that people would now aim for fixed BTC payments. Back then I used to do bounties just for funsies and hey money is money and why not try to test the waters.
I wasted almost 3 months for just worthless tokens.