The thing is, it becomes a slippery slope. It's "corp accounts are pre vouched today", "non corp accounts are temporarily suspended for a few days during some downtime", to "we've decided to only allow corp accounts going forward".
Where does the frog stop getting boiled?
I'm pretty sure decimalenough was talking about having the project structured in an org and only allow org members to contribute, not to automatically allow contributions from people that are members of a completely unrelated, corporate-managed org like google.