Actually, is there a need to block anything? They're coming up with a mining-focused product line now. Just make them slightly cheaper per hash and voila - all miners will be buying the mining-focused products. They lack the video outputs so it makes sense, you can skip some of the BOM on the card, save a few bucks. As it has already been mentioned in the thread miners are super sensitive to squeezing every cent out…
All of that isn't possible with the mining-focused line, so Nvidia feels they need other tools to help convince the cryptocurrency miners to move over, hence the block.