I actually looked into it and got the quote wrong, it's not Amazon Alexas globally, it's all "always on devices" in America; including computers, gaming consoles, etc.
That is almost 630 watts per person (250 million people, 24*365 hours per year)... That seems like a lot...
As a north european techie spending power on quite a few always on things (respberry pis, a nas, a router, wifi, ps5 etc)- but also freezer, fridge, cooking - and lightning for half the year and a little extra heating, I have used around 2500 kWh year to date, which is roughly 320 watts in total (or half that stated figure for always on devices alone...)
EDIT: I remembered the american population size wrong, the right figure is 475 watts @330 Mln people, but my point stands..
I would say less technically savvy people probably use more electricity, not less. And you're assuming that you're the average American consumer. There are probably old toasters and electrical heaters that contribute significantly to that figure. In any case, the conservative estimate is still several times that of Bitcoin's usage.
I'd also say cruise ships are more egregious, which no one seems to care about despite them definitely not using clean energy or being remotely useful, using 2.5x the amount of energy as Bitcoin - or as much as Spain!
From googling and "This Machine Greens" docu:
> American always on devices: 1375 TWh per year
> Cruise ships: 250 TWh per year
> Bitcoin: 116 TWh per year
> Online advertising: 106 TWh per year
> American Alexas: 1.52 TWh per year