Jewcorp does a lot of chest beating and pretend to be more popular than they actually are.
The truth is that there is a really big gap between small corpos run by some weeb entrepreneur who burns a pile of money to create his own personal mini-agency with some merch, a couple managers to sort shit out and maybe a 3d stream once a while.
And a major mega-corpo that owns 30% or more of the market share, has dozens of world-famous chuubas in its pockets, employs hundreds of managers, engineers, in-house riggers and software devs, has it's own custom software and has direct lines of contact with artists, musicians and other companies while also being invested in by actual firms for millions.
There is a really big gap there and that's why I never include Vshojo in the "major corpos", Holo and Niji are simply orders of magnitude more powerful and influential, they are the chess board and everyone else is simply one of the pieces playing by their rules.