I think this is prone to sybil attacks since it probably won't be hard to create fake followings and game the verification.

Could you be more specific? How can they game the verification? The community is pretty diligent about fairness.

I do like that you use followers as a parameter for delegation.

Delegation is still a top-down control decided by whales. It isn't spontaneous formulation of new communities in a decentralized manner which I posit is necessary for viral growth.

It seems to me that offering some extra voting power towards motivating uniqueness of followed groupings, provides a balance between disconnected groupings and one-size-fits-all.