I think "evolved" is the wrong word in this case, probably degenerated is a better choice. Most of the stakeholders have sold out of Steem, which leaves most of the coins concentrated in a small number of hands. This is also focusing the rewards into the hands of a relatively few people.

I don't think it's really a Korean thing, so much as a particular group of Koreans (not really the same thing). Looking at the posts on trending, you can see it's the same people, over and over. This might make sense, if those people were devs producing work for the chain or exceptional content creators, but that's not the case.