Have you actually tried to do what I have described? If you want to test, try with a studio Ghibli movie on Netflix, they have dubs and subs for a lot of languages.
Go buy a Netflix/Max/Prime/etc account in Mexico/El Salvador/Indonesia/etc. It'll be 1/3 the price and you'll be limited to "original" (usually English) and Spanish for dubbing/subbing. In some cases you won't even have the original options. I've lived in a few of those low CoL regions, that's literally how it works.
As I said in the following paragraph (which you probably also didn't read), those limits do not exist for most accounts originating from English-speaking regions (especially North America) and some Western European nations. So if you're using your American/British/Canadian/etc account to try to disprove a point I never made, it's already been addressed.
Just....read.
The only regions that give you carte blanche (in general) language options are the anglophone countries and some EU regions.
But they're also geocoded (presumably, for travelers), so if you can get a VPN/tunnel that works, you can use another regions' primary languages. Max, last I checked, is the only one that outright limits usage outside of your region.