Quite frankly, there is nothing that is not allowed on Steemit! It kind of comes with the concept of decentralization. As far as I know there is no way to ban accounts or for Steemit itself to take any punitive measures. It's up to the community to decide what is appropriate and use the tools in their power to shape the platform. The main tool for this is flagging. On other Steem interfaces (such as Busy.org) the flag function is represented as a downvote and I feel that is how it should be perceived. Just as berniesanders laid out his reasons for flagging Korean community posts, eirik is making a good case as to why these posts could stand some flagging as well.
I have nothing against bot voting, I use it myself. But I regularly adjust and monitor my auto votes if I feel a contributor is posting too much content, sub par content, etc. Automating the task of supporting certain authors or communities is very helpful, but there should be conscious thought behind it.