Close to my theory! Basically, they need to send out millions of email fast. This email, with a bunch of legal text will probably have a high 'mark as spam' rat

Close to my theory! Basically, they need to send out millions of email fast. This email, with a bunch of legal text will probably have a high 'mark as spam' rate. This will destroy the domain's marketing ability. SO! The marketing guy won the argument in the meeting: don't use the root domain.