Proof of camera wouldn't work either :D
It is actually quite a tricky problem I think, because even if there is a capture or fingerprint, it doesn't mean that people aren't using a bot for the selection process. When there is money on the table, people will happily do whatever they can to get to it.
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Money is the motive to change our behaviour if is easy to get it with a bot or other meaning.
we all work on incentives - money is a large one for most of us.
Even when you are volunteering, you have an incentive to the cause without money, of course.