Interesting, but how does it protect against vote monopolization?
In other DPOS chains the majority (if not all) of the inflation goes to the block producers. By offering kickbacks they can ensure that the stake that votes for them grows much faster than the one that does not.
Steem distributes the majority of the inflation to none witnesses thus the block producers have little incentive to offer kickbacks to their voters. After all they need to maintain their infrastructure and the witness pay does not leave much room for such deals (they only get 10% of the inflation).
This does not mean that steem is not vulnerable to such degradation of consensus. It just means that it would take a longer time to playout.