good post and you summarized main aspects of bounty service here.
On KYC point i beg to differ as privacy is important part for any person. There are many bounties so doing kyc with all is not good specially if they do exit scam later (most of bounties are scam). Also if you think KYC can be helpful for removing multiple accounts then unfortunately there is grey/OTC market where people sell kyc data for some bucks, so the purpose still remain unfulfilled. People even selling binance verified account however binance started video verification too.