In animes, I've seen several times characters mentioning "VTube" , a social network just like Youtube, but with a slightly different name. If I recall correctly, one anime I've seen it is in one episode of Kaii to Otome to Kamikakushi, I'm sure I've seen it in other animes I dont recall right now, and a new anime just appeared called VTuber Nandaga Haishin Kiri Wasuretara Densetsu ni Natteta , so that's another.
My question is, is this a real social network in Japan, and anime it's just reflecting japanese culture, or is it an anime trope made up to avoid having copyright issues with Youtube?