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My initial response was "Damn, I'm running everying off a UPS from now on" until I read this:

Battery-powered devices are not immune to to ENF analysis, as grid frequency variations can be induced in their recordings from a distance.

I'm slightly skeptical of that, but if it's true, it's pretty impressive.

"Damn, I'm running everything off a UPS from now on, and in a faraday cage if it's not far away enough from a mains line."

Faraday cages don't block low frequency magnetic fields. You would also need some mu-metal.

John Varley's 1984 novella "Press Enter _" (Hugo winner 1985), had something along those lines, if memory serves.

I had the same response, but then I thought "wait, I don't do any covert and sketchy surveillance, this doesn't affect me".

Can you think of any privacy concerns with this technology?