>>11313489I'll give you some numbers as an example to help you understand.
Say a Vtuber in 3 days streams 1 game everyone streams, 1 game only four other members streams, 1 game only they stream. Basically all the Vtuber's majority content in this example, 2/3, is varied and not the game everyone streams that month. But as a group streams that game, so you notice "wow everyone plays Minecraft", when everyone individually has the majority of their be varied content, and you notice "only five people have played DQ/FF/NierAutomata/etc", and wow "only one person has played Shiren the Wanderer/EDF/XC/Hayarigami/Mother3/MajorasMask/Celeste/PepsiMan/etcetc". Even though there is a bunch of varied content, you who aren't looking at youtubers individually to see they play a variety of games, just notice the game that's played the most among the most Vtubers and ignore the games that only one member plays. This is a simplification because I don't want to write more, but a helpful way to realize why you're wrong.