https://www.wepc.com/news/video-game-statistics/#pc-gaming
74% of all the video games and computer sales were sold in digital format form.
That's just one source. You'll find similar numbers confirmed elsewhere.
PC gamers overwhelmingly buy digital, either from Steam or other digital storefronts like GOG, Greenman Gaming, Epic Games Store, Origin etc.
"29% of Steam sales revenue was attributed to Western Europe according to Valve. (GeekWire, 2018)"
The typical US == The World view.
Don't be so presumptuous, it's arrogant.
And you are cherry-picking stats by stating only sales on Steam. Steam is not the only digital delivery platform on PC. There are many.
From 2014 worldwide:
https://www.kitguru.net/gaming/matthew-wilson/92-percent-of-...
92% of game sales worldwide were digital.
From 2019 in the UK:
https://www.eurogamer.net/articles/2019-01-03-uk-video-game-...
80% digital sales for games in the UK alone.
And it's not just the UK and US.
https://business.financialpost.com/technology/gaming/digital...
The number of physical sales is declining everywhere, some quicker than others.