that doesn't mean a single thing - google would auto-default to IP country resolution every step. It's funny in an awful way to have a road trip in Europe - every day it's a different language. While I speak 3 languages that's far from sufficient, morealso google translations leave a lot to be desired outside English (as everything is designed in US,incl. date formats [mm/dd], units - inches and miles, etc.)

Accept-language doesn't do anything at all for google, either.

It doesn't work, you can set all the languages you speak on your Google account settings, and Youtube will still change every video title and audio track to either your default language on settings, or your system language. At this point I don't even know what stupid decision between the two above the Youtube backend is choosing.

Yes, this. Google still doesn't get even the Accept-Language header right, which is shocking, because they're Google.

Would be great if they actually use it in their products instead of showing me some insane mixup of stuff I don't want :)

It's gotten to the point where searching Google for word definitions is actively hampering me by defaulting to showing the definition in my "regional language" (which isn't correct in the first place since it's spoken by a majority in my country but not in the region where I live) as well as English when I only want the English meaning. Stuff like this has had me switch to DDG where even if the results are strictly worse, at least it's not going out of its way to annoy me

The very fact that Google allows multiple language setting yet still fearlessly screw you at every turn is the biggest sign IMHO that they just hate multi-linguals.

I see it as the other side of Hanlon's razor: we know there's competent people there, we should fully attribute this to malice.