I highly doubt Nvidia or AMD had any part in creating Bitcoin as a way to increase demand for their products.
That being said, they sure are benefiting from it, and they certainly would benefit from ensuring that PoW continues to be the dominant force of the blockchain.
I fully agree but i would wager all my cryptos on them to have created ETH to boost sales so production lines would not be bleak. a car and a video card a two very seperate things.... do you know how many car plants shut down?