There are plenty of independent vtubers out there who don't do the idol thing. But since the biggest vtuber company (Cover Corp/hololive) is putting a lot of focus on idol concerts and idol culture, there's definitely a "well the most popular ones are doing it, so I've gotta be doing it to" mentality.
Re: ITT: NAME A THING YOU DON'T GET AND SOMEONE WILL EXPLAIN THE THING
There are plenty of independent vtubers out there who don't do the idol thing. But since the biggest vtuber company (Cover Corp/hololive) is putting a lot of focus on idol concerts and idol culture, there's definitely a "well the most popular ones are doing it, so I've gotta be doing it to" mentality.