This type of change in rules do often happen.
And there's no way to stop this if they are the ones who are running these bounties. A bounty manager that has integrity would save your time from avoiding these type of bounties that suddens requires KYC when the bounty is about to end.
But the problem is they were charging the bounty participants to do KYC
1 week before the bounty ends. That's is the problem.
I think you haven't understand my point.
Yes, I know the problem and I'm aware that this is one of your concerns as a bounty hunter because I've seen someone complains about this before. And my suggestion is choose a bounty manager that is firm and reliable with such ruling of the bounty he's managing and won't have this sudden change prior to the end of the bounty.