I'm pretty new to the whole Vtuber thing, but I know it's pretty massive, especially in Japan. In Korone's case, SEGA Japan gifted her some official artwork of Sonic holding a birthday cake earlier this month. Plus she's on the sides of transit buses too (CR article here). Plus Gawr Gura did make a cameo in that Taco Bell anime advertisement during the Olypmics.
Hop onto one of the big Vtuber's streams sometime and observe just how much money these girls are taking in via Superchats. Hololive especially is big business. At least Korone is actually enthusiastic about the franchise.
