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it does not violate the rules if they can change the rules based on their needs. Well, I know that many people don't like changing policies, even I don't like it when things change at the end of a sale. however, if it has a clear reason, I think it's only natural. as long as they still maintain the quality of the token, and paying it is enough. cheating is when they always postpone the time of payment and make it difficult for those who will be paid.
Changing the rules is annoying, especially with KYC. I am reluctant to do it if the rewards are not comparable. The classic reason for the dev team and the bounty manager is to eliminate cheaters or multi-accounts, every time that reason is given, I always wonder: why haven't they implemented it since the beginning of the bounty period?