I have much simpler explanation why miners should be regulated as Money Transmitters than the one described in the article.
Thinking from the first principles: what PoW, if not an obfuscated way to buy tokens/coins? I.e. you exchange money for electricity, then electricity for compute power, then computer power for a right to play a lottery, then periodically you win tokens/coins.
Money bag → High voltage sign → Personal computer → Slot machine → Coin
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