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.
Anyhow, it is in a grey area
First of all, the reason why some companies insist of requesting KYC from bounty hunters because they wanted to make sure that 100% of their token allocation are allocated to people who are genuine and legit
Although i am slightly against of it because it is risky for the bounty hunter, and not that necessary for the company (It depends on the regulations)
But if one company wanted to have a safe state from their company, it is better to follow and provide KYC in the case that the company is genuine and legit
You don't wanted to give your KYC to some random people who uses your KYC and went off for frauds