[philcrump]

Note that this is often done based on your IP address if you've not opted-in.

It's often a quirk when using CCC (Chaos Computer Club) IP addresses at events in other countries; you'll be looking at google.de for the first couple of days until google correlates enough location data from people that have opted-in to correct the IP location.

On the plus side it means that a personal VPN with no opted-in devices will give you your home-region services (ymmv).