Proof of stake is called, obviously if you have a bad distribution this system is condemned to the failure but the amount of votes available for the witnesses and also the lack of an upvote decay were vectors of attack already in STEEM.

We have solved one issue but the system should be improved yet. I should blame only to the bad distribution?, the one that we have now isn't very encouraging also, I mean most of the stake is holded by whales and orcas still. Hasn't changed so much.