As others said they're a US company, but I think what makes this the bigger story is that VShojo has always been the "we're not like other girls" of VTuber corpos. The bulk of their talent recruitment marketing has been advertising that they offer "talent freedom" unlike those dirty Idol Culture companies who have rules and guidelines, and they very specifically pander to the Twitter socialist crowd who think standard business practices like the company retaining the vtuber's IP ownership are inherently exploitative.
Her going straight for the emotionally-driven "they stole money from this charity that means so much to me" angle is actually genius, because it completely nulls and voids all the virtue-signalling marketing they've done over the last few years. This isn't the kind of thing they can dig their way out of by reshuffling a few managers around; they sold themselves as the good guy corpo, and now everyone knows they're not good guys.
It's not even like they can start panic-selling parts of the business, since aside from the merch they don't really own anything; I would not be surprised if the other talents all bounced as soon as their contracts are up too, because they all own their respective IPs and have absolutely nothing incentivising them to stick around.