Op said nothing about only allowing corporations. Simply stated that one path to allowing large swaths of users without having to approve every single individual user is to trust all users of certain orgs by default.
Presumably you would still allow individual contributions but with restrictions unless someone has vouched for them or some other gating factor.
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.