I'd be more willing to bet that it's because my GPS location is in Japan, which is the strongest signal of my physical location. Nevertheless, my home IP is used by multiple people, they probably know who they are and that they're not in Japan. My own signals are a mix of VPN'd/non-VPN'd apps on my phone and laptop (not strict about the VPN, some Japan sites require a Japanese IP), and I do often NoMachine back to my home machine and access google services just like I do at home.