Comment by sbinnee

Yes and no. They used to prefer everything on premise. Many try to move towards cloud especially newer companies. Major cloud providers you mentioned are not the usual choices though (maybe aws is the most common). They do have data centers in Seoul and try to expand their markets for South Korea. But government offers generous incentives for using domestic cloud providers like NHN which was mentioned in the article or Naver cloud. Why does this work? Because Korean services rarely target global markets mainly due to language barrier. Domestic cloud usage is sufficient enough.