>>54302984Because they're both offshoots of anime/weeb culture. They're both trying to sell you waifus through different means by getting you hooked. It's the same people involved too, vtuber artists are usually also gacha artists.
Pic related. Notice any similarities? It's a character from FGO, courtesy of Kronii's artist.
It's ironic how gachafags hate vtuberfags and vice versa when the two communities have so much in common.
