The sybil problem is typically solved either by proof-of-identity, or collateral/investment. The proposal revolves around the first method with a "twist" about unique followers. I fail to see why this is necessary anyway. I mean if you solve the sybil problem, then you don't need second-tier algorithms anyway. You can just give a vote to anyone verified and let them run free with those votes. One person / one vote / system working as intended (and free of "inequalities" or sybil-attack).

The huge difficulty is on the verification side (easier said than done) plus not all people want to be verified. I would argue that there is a greater value proposition in even allowing anonymous posters to enrich the platform with their content - as sites like godlikeproductions do, although, apparently, we return back to the issue of "fair voting". I don't know - I'm not really a fan of verification to be honest for multiple reasons.