Companies that conduct a KYC procedure for bounty hunters can divided into 2 groups.
1. Companies that initially write that there will be a KYC procedure. To such companies there are no special questions, who wants to take part in their bounty campaign, he'll be, who doesn't want - will not.
2. Companies that first not planned a KYC procedure, and then, at the end of the bounty campaign, declare it necessary. Such companies are scammers, IMHO.