As the vote bots get more income over time they will become more powerful.
I predicted/proved in 2016 that there was no solution which could make “proof-of-brain” equitable.
The whitepaper of Steem even admits that the “proof-of-brain” reward system depends on being able fool most of the users into doing more effort than they will be equitably rewarded.
I have written a point-by-point rebuttal of @jerrybanfield’s incorrect propaganda campaign.