Yes bounty manager sometime put up the need for know your customer k. Y c to be able to detect the nationality and identify the customer so it important to be used in bounty
That is not their purpose. Their purpose is to know if a participant is using a multiple account in their campaign. It's not about the nationality. Do you have an experience joining in a bounty campaign? If a bounty requires KYC, for sure its a scam. Most of it are scam so beware of it.
Do you have enough experience that most bounties requiring KYC are scams? Although I have never yet participated in bounties requiring it, I might in the future, but if what you said is true, then maybe not.