Kibousoft is just a couple people doing web development. It's as much of a "corporation" as I am, since I am self-employed and doing web development. mastodon.cloud was struggling with an owner who had no technical experience, so the people of Kibousoft offered to take it over. It wasn't bought out.
I'm sad to see people spreading misinformation about this. One of the Kibousoft guys was co-admin of KNZK and is one of the nicest people on here.
Mastodon hosted on mstdn.maud.io