A good practice but won't help with this issue. Google has a history of banning business (admin/paying) accounts when it thinks that some user (under that business domain) has an unrelated personal account that was banned.
There have been stories here on HN describing how a small startup lost its Google Play account because one of their employees had their personal account banned for a terms of service violation. Then Google viewed that same person having an user account underneath the business account as ban evasion. In a puzzling move Google then proceeded to close the whole business account, so lots of collateral damage.
It's pretty crazy stuff.
Someone had a private, secondary email in the profile.
A private gmail account was suspended. They suspected that he has sent a "virus" in `*.apk` file as a gmail attachment.