I share my US family plan with friends in the UK. Their account would be banned occasionally. So, Google is probably aware of this hack, it's just they are not

I share my US family plan with friends in the UK. Their account would be banned occasionally. So, Google is probably aware of this hack, it's just they are not enforcing it too seriously. EDIT: they only banned the added family member, not the account owner. My workaround is to just recreate family member account.