Here are some projects that get listed on exchanges but ignore bounty hunters and airdroppers like they don't exists
I don't really see why any team will refuse to pay bounty hunters for their hard work, if you promise people that you're going to pay them a certain amount for promoting your project then you should do just that, doing otherwise should be considered as a scam. I don't care whatever reason they might give for it, a scam is a scam. They shouldn't blame bounty hunters for a decrease in the rate of their Tokens, it's none of their business, they just did their job and they deserve to be paid for it.
dont know what the case might be with you but Nastree and sero paid, this are the projects I took part in and received my pay from them. Maybe you defaulted some rules or something
This is the reason, scams are not being moderated in this forum. We cannot have any general action against such devs as not paying the bounty rewards should be treated case by case. OP must start open accusation and I guess there are highly influence people are there in this forum and they may talk to exchanges to take action against scammy devs on proving situations.