The only way it can be fair is to be able to guarantee that people can't simply buy votes from bots. You have to be able to guarantee that the curation (proof of brain) is functional.

And since you can't clearly guarantee that part why would we be confident that it's going to be fair if every account has equal weight when the majority of votes come from bots etc? How do you change the situation to where posters are encourage to earn votes rather than buy them?