Liquid nitrogen is not expensive. The most expensive part is storage silo, but we can try build one instead.
It becomes expensive once you need it 24/7 for thousands of miners and, unlike other cooling methods it needs constant care.
Liquid/Immersion cooling is far easier and cheaper.
It can be used in any industry and help slowdown global warming as well.
What does this have anything to do with global warming?
Please don't tell me because you're cooling the miners is gets colder cause then I might just buy another freezer to help in the war.
If it's about efficiency then it will solve nothing as lowering the costs for running a TH/s and it would just make miners add more since the profit margin will just grow. In the end, the same amount of energy will be spent, the only thing that can limit that is the daily reward value.
Complicating things a lot and adding a need for a lot more stuff, creating dependencies on another provider, adding a supply chain that is not needed right now, also adding the need for new permits, new specialized workers, new inspection and in the end new headaches.