Many bounties have already says it all in their rules and regulations that 'THE BOUNTY MANAGER HAS THE RIGHT TO CHANGE RULES AT ANY TIME' when you see something like that always know that anything can happen ,the one way to avoid this is if there is no such rules on the bounty thread.
Bounty hunters still find it very hard to read,they care less about rules and go for the good looking bounty allocation, please have patience and go through rules and regulations ,most times its not always the bounty managers fault.
I know that the bounty manager and the team can change the rules of the bounty.
But with all the respect, bounty hunters are just asking if there will be KYC, kindly put it at start.
There are some bounties in other country which doing KYC is illegal.