>>42983412ライバー is a generic Japanese term for a live streamer, they just adopted it to distinguish their main USP from that of a "virtual youtuber".
https://ja.wikipedia.org/wiki/%E5%8B%95%E7%94%BB%E9%85%8D%E4%BF%A1%E8%80%85>英語圏では、オンラインストリーマー(英語: Online streamer)、ライブストリーマー(英語: live streamer)と呼ばれる。派生して日本ではライバー(和製英語: liver)という呼称もある。>In English-speaking countries, it is called "online streamer" or "live streamer. In Japan, the derivative term "liver" is also used.At the time when Nijisanji was becoming a thing most vtubers mainly posted videos like a normal vtuber. So if someone who mainly posts videos is a virtual youtuber, they are virtual livers.