You're mistaking what a company started as for what it is now. Nvidia hasn't just been a video game card manufacturer in well over a decade, and hasn't been primarily one for quite a while now.

They are the premier manufacturer of electronics that power all the current AI. Why wouldn't they be contributing heavily to the space?

https://www.nintendo.com/jp/others/playing_cards/lineup/stan...

They also make legal threats I think.