To my understanding, KYC simply means "Know your customer". Investors(customers) who participate in ICO are made to go through KYC process before they are even allowed to purchase their tokens. On the other hand, Bounty hunters are just "part time workers" of the project and not customers. Even if they will be made to go through a KYC process, it should be before they start working and not after. Waiting for them to finish working for the project and refusing to pay them because they failed to pass KYC afterwards is a total cheat.
Well in part everything you say is real, you also have to see it from the point of view of the projects that are legitimate, and authentic, in fact in an ICO project that I am participating in, they became STO, and I asked them why they demanded the KYC? They answered that they did it to avoid frauds with multi-accounts, apart from that they have a validation process x3 and the last validation process is done by a company external to the validation team that they had hired.
This way over time, I asked again why they were still? and they responded that they had discovered many scammers who wanted to get the tokens in a bad way, taking the opportunity away from those who had done their AIRDROP phase and tasks respectively, and who wanted their Tokens to reach the people who deserve it.
These reasons, I think very good, also the project looks very stable and I give a plus many times to the KYC although it often bothers, especially for people who love anonymity.