Never worked at google, but I use their services and moved country recently.

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

Maybe it has changed, because this was not my experience: my methods of payments have all remained the same. It appears to be based on IP, because my transition was delayed compared to family members who moved with me because I had VPNed back to the country I had left. I’m pretty sure it was IP based, because the relative delay approximately correlated with how many days I’d used the VPN for.