Xoogler here.

The way I remember this working is that it is entirely dependent on the methods of payment (MOP) associated with your account. If you remove MOPs from country A, and then 30 days later you add a MOP from country B, your underlying gaia account will have the home country migrated (affects play store, etc).

The workaround is to use different accounts, each with MOP from different countries. Pretty sure IP doesn't matter.

Regarding which legal jurisdictions apply between you and a company like Google? Well, the courts are probably not going to consider what it says in your account profile.