Do you read their rules before joining their campaign? Almost it has: "Team project and bounty managers reserve the right to change the rules"
Even changing percentage of allocation for each bounty section. So, if they will distribute rewards afer doing KYC, I think it's ok. It's only problem with cheaters.
they are using that strategy because when you failed to comply it the stake will be going to them,i am agree with kyc but in the beginning they must announce it and not by the end.they have the rights to change the rules its true but they take advantage for sometimes.