Transactions aren't the issue, except insofar as they are motivators for production. It has to do with the vast amounts of energy consumed when "mining" a new Bitcoin. This isn't a problem in a relatively carbon-neutral power grid like Musk's Bay Area haunts, but if you're burning, say, dirty coal to produce Bitcoin, the cost of the digital land grab can get extensive. And even on a cleaner grid we could still ask whether it makes sense, given limited environmental resources, to commit an entire nation's worth of electrical production to "mining" pretend money with little real utility.
You can read more at this link:
Russia's largest bitcoin mining farm.
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Not a problem when the taxpayers pay the electric bill but the profits go to the elite.
That image makes me want to listen to Bone Thugs in Harmony's "For the Love of Money".