I think that was the point of the meeting. They saw that there was a developer in the space they wanted to enter. They could have just undercut him without a thought, but instead offered to work with/buy out his product. This happens.
Microsoft and Google are doing it with hardware. I imagine the phone/tablet manufacturers had a similar reaction as this guy, but didn't go blogging about it on the web. It's good for us that he did, because OEMs talk to each other in meetings. Small time devs best communicate a company's intentions via the web.
Except that it won't, i.e. Microsoft in the 90's and Apple on the iOS/Mac platform. Businesses will follow the markets which have the greatest opportunity to turn over profit. In fact Microsoft used to call their relationship an "ecosystem" because like a predator they would gobble up or crush the smaller players.
It's one thing to use Facebook for authentication. It's easy and takes little investment. However, building a REAL product on the platform is a risk. If Facebook behaves like this, they show that it's a risk NOT worth taking, and they devalue their own platform, putting short term gain (product) over long term gain (platform).