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Probably not many if you don't count small individual art studios - the mobile gacha game industry(and anime animation to some extent) don't standardize art styles and pipeline art production as done in American movie and comic industries, but relies on intimate collaborations with external, individual artists for creative components.

So they mostly only import (Krita-exported) PSD into Ps, or even if Krita was used professionally on the floor by employed artists, choice of tools would be up to artist's discretion and might not become a corporate talking point in the way, say, what Maya or Lightwave debate would be.

Maybe OnlyFans/Patreon could throw a million or two for couple years...? But Krita is not the first choice across the board, and creators on those platform don't seem too concerned with CSP/Procreate subscriptions, so that might be a difficult path too?