(One of the comments on the page.)
But wait a minute. Killing off the free drinks is just the signpost. The change is primarily in the size and the culture of the company itself. Charging for sodas might be the first, but it isn't the biggest change that the company is going to, and going to have to, make as it grows.
Does anyone really believe that IBM, Amazon, Facebook, or Google would still be their happy fun startup selves if they still gave away free sodas?