According to this Redditor Masangsoft actually is interested in publishing on Steam. How leditimate this thread is though, I'm unsure. And since it was posted back in 2019 I'm assuming even the Reddit poster has forgotten about it as well.
https://www.reddit.com/r/gunz/commen...ore_news_from/
Also you can petition for GunZ on Steam. 2,500/5,000 signatures so far! (not like this will actually do anything???)
https://www.change.org/p/masangsoft-...-gunz-on-steam