What's most annoying is that local companies make exactly the same mistakes. Digitec, Migros or Galaxus they all default to German. And I use Accept-Language as well. I understand this is a special case and the heuristic works in most cases, but when you're a Swiss company operating in Switzerland the odds are slightly different. Only 63.5% are native German speakers.
But google is by far the worst, since I'm always logged in but switches languages based on IP.
But google is by far the worst, since I'm always logged in but switches languages based on IP.