I don't know why so many of you are looking for an official response from pg. Just because he invested in the company doesn't mean he can or will make statements on their behalf.
Honestly pg just probably invested, said good luck, and just went his own way checking up occasionally to chat. The guy has like 500 other things on his plate why would he micromanage airbnb?
It's their business, not pg's, so let them run it how they want to.