Nvidia managed to sell over $150 million worth of GPU dies to miners...
If they had that kind of relationship with some of the bigger mining farms I wonder if they would sell actual GPUs (though they do have better resale potential) rather than output-less compute cards which were optimised for mining (which would be much better for income for the miners). Because you are going to need some fairly serious industry relationships to sell that kind of volume to mining without openly doing so.