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It hasn't taken off because it doesn't work. PoW only works for things that are hard to calculate but easy to verify. Any meaningful result is equally hard to verify.



> Any meaningful result is equally hard to verify.

This is very much not true. A central class in complexity is NP whose problems are hard to answer but easy to verify if the answer is yes.

E.g. is there a path visiting all nodes in this graph of length less than 243000? Hard to answer but easy to check any proposed answer.


It's easy to verify ML training - inference on a test set has lower error than it did before.

Training NN ML is much slower than inference (1000x at least) because it has to calculate all of the gradients.




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