Interesting point about public transportation -- by creating a private bus system, tech companies are actively suppressing demand for better public transport between SF and the valley.
The bus provides an appealing (relative to the Caltrain) option that's appealing to people who could also easily afford to drive. (They're more convenient than the train or driving, to boot, whereas taking the train is much less convenient.) In doing so, they take tens of thousands of cars off the road each morning.