Rather than collapsing, Ethereum sought to reduce the energy footprint and they did. Now Nvidia is angry that nobody wants to pay a premium for a 4090 that catches fire.
First, a top of the line card like the 4090 blows away everything else in terms of perf. Second, it (and other Nvidia hardware) is actually usable for something other than driving a display/gaming.
In the end a 30% (or whatever) premium for cards that offer better performance and can actually do stuff results in the obvious (buy Nvidia).
Nvidia isn't angry about anything.
[0] https://overclock3d.net/news/gpu_displays/amd_s_gpu_market_s...