> They didn't make their GPUs for crypto.

Sure they did and still do. They did a good job of managing the bubble but participate in the market nontheless. Read the above article: Nvidia has promised that its new lineup of cryptocurrency mining GPUs, called CMP for short, won't impact the supply of GeForce graphics cards for PC gamers. . . Since these cards are destined for mining rigs they will also lack video outputs. That may mean the resale value is diminished, which has been one reason why miners prefer gaming graphics cards.

Or take it from the horse's mouth [0]:

  NVIDIA Cmp Hx
  Dedicated GPU for Professional Mining

They made a dedicated chip because miners were buying up all the GPUs from gamers.

They also nerfed GPU hash rates through software to prevent miners from buying them.