The obvious difference is that AI has abundant use-cases, while Crypto only has tenuous ones.
Maybe there is added negativity considering it is a technology where there is clearly a potential threat to jobs on a personal level (e.g. lift operators were very negative towards automatic lifts).
This is solid economics iff you assume that crypto has a utility for which there is no substitute which does not share the same supply constraint feature, and even then its not solid economics for a current investment unless you also assume that that utility is the entire basis for its current valuation. Because even if it has a nonsubstitutable utility, if that's not the basis of its current value, then the "solid economics" is that there is some price it could reach from which further value drop because of supply (of substitutes) will not erode value, but there is no guarantee of what that level is.