Google and Apple are paying for the stops now.
These employees might drive to work (worse for the environment) if this bus service was not provided since public transportation might not service where they live.
It on the other hand provides a tangible, accessible symbol to demonization and attack with rhetoric.
Don't like it? Then you might think a bit when a news network or a comedy show starts hammering a group.
[edit] I should add I don't agree with the protestor's plan of action or targets, I'm just trying to explain why and how effective their targeting is. Its a long tradition and very easy for the public to buy into.