Still though, this isn't something that will just go away with Sam back. OAI will undergo serious changes now that Sam has shown himself to be irreplaceable. Future will tell but in the long terms, I doubt we will see OAI as one of the megacorps like Facebook or Uber. They lost the trust.
It's true that this doesn't really pattern-match with the founding story of huge successful companies like Facebook, Amazon, Microsoft, or Google. But somehow, I think it's still possible that a huge company could be created by a person like this.
(And of course, more important than creating a huge company, is creating insanely great products.)
You forgot about Apple.