I think the main problem is that there are a lot of cheaters that are using multi accounts at the same bounty to earn bigger rewards. I think KYC solves all this problems and you can also proof that it was your article because you have added it to the spreadsheet first.
KYC procedure is acceptable for trusted ICO / projects. Sending your personal data to unknown person / group is not the best idea.
Or bounty organizers should also disclose their persons to the participants, like KYBM (
Know
Your
Bounty
Manager) procedure