For commercial software, definitely. It'd be web and MAYBE Windows unless there's a Qt nerd spearheading the project or something.
FOSS is actually better off here IMO, since it's done by people as passion projects, so there's no need to pinch pennies by eliminating target platforms. HOWEVER there'd also be more need for the devs to have different platforms to test on.
So why would you, an anarchist, defend those who literally simp for dictators? Because I'm talking about people who literally simp for Russia and China, which are capitalist countries - China minted more new billionaires in 2024 than any other country. Sure, it also has a bigger population than any other country, but if it was in any way communist, wouldn't they prevent billionaires from happening? And I'm sure you understand that modern day Russia is about exactly as communist as modern day USA.