Except, in non English speaking counties, the vast majority of people do not change the Accept-Language header (through various browser/OS mechanisms), and receive default results. But then experiments show that they are more likely to interact with pages when shown in the languages Google thinks you actually use.
If you go to myaccount.google.com/language , you can remove languages you don't actually speak, or turn off automatically adding languages altogether. It doesn't always work for everything, but it's a good signal.
I agree there should be a way to force this better, but there's a bunch of work being done on it.
You can add a hl=en parameter to the URL, and most Google apps will respect it.
If you go to myaccount.google.com/language , you can remove languages you don't actually speak, or turn off automatically adding languages altogether. It doesn't always work for everything, but it's a good signal.
I agree there should be a way to force this better, but there's a bunch of work being done on it.
You can add a hl=en parameter to the URL, and most Google apps will respect it.