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6. If a project advises for KYC and you dont like, just dont do it.
Other than what you mentioned, that is the one important reason. I'm sure most of the bounty hunters (ya, including me) avoid the KYC process on the bounty. That's why there are some people didn't get paid after the bounty ends.
there are some things that cause participants not paid is,
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4. Error in typing wallet address
But I think it's wrong. If something like that happens, we can still change the wallet address at the end of bounty as long as we can give the valid proof and the evidence reason to change it.