Yeah, I'm sure that helped Kizuan Ai, Mirai Akari and Shojo Siri stay relevant... Also, very small amount of vtuber manga or the tag isn't that good at finding them. Here's all the stuff I could find just looking at vtuber, virtual youtuber, nijisanji and hololive on mangaupdates:
Official (14):
Virtual YouTuber Kizuna AI Official Comic Anthology, Virtual YouTuber Dennou Shoujo Shiro Koushiki Comic Anthology - Pai-n Shiyou Hen, Virtual YouTuber Mirai Akari Official Comic Anthology, Hololive - holoX MEETing!, Horogura Modoki, Kiritsu! Kiwotsuke! Nijisanji Gakuen!, NIJISANJI ID Days, Nijisanji Samba Carnival, Tonari no Vtuber, VTuber wa Mama Naranai!, Oyaji ga Bishoujo ni Natteta Hanashi (Mori's favorite), Akari wa Yukihime ni Naritai -Nekurana Hiki Komori ga Vtuber ni Natta Riyuu-, My Best Friend Who I Love Fell Completely in Love With My Vtuber Self, The Four God VTubers Who Really Debuted After 100 Days.
Oneshots (04):
VTuber Kaobare Yuri, Leonardo da Vinci Became a VTuber, A Story About a Certain VTuber, A Story About Two VTubers
(1) Nijisanji dj, (2) other vtuber dj.
There may be more if i input other vtuber names I could find a bunch more doujinshi but that doesn't seem huge given how long they've been around.
