Except that in Iceland, crypto mining could literally, and I use the word literally in the classical and correct sense, actually negate the problems of smelting. If crypto miners out-bid aluminium smelters on power prices, the smelting will leave Iceland and move closer to the source of the ore without any net loss in income to the Icelandic economy.
The economy of aluminium in Iceland /is/ the economy of selling electricity to foreigners. It generates some dock work as well, but the bauxite is here for the power prices, not the light touch of the local forklift drivers. If we can sell that electricity without shipping things, that's obviously better.
You're welcome to think that's idiocy if you like, I guess.