This is my point; something like a municipal bus system has very high barriers to entry, even without a government-created monopoly. This extends to operating c

This is my point; something like a municipal bus system has very high barriers to entry, even without a government-created monopoly. This extends to operating costs, specialized equipment, union negotiations, etc. Google was operating in a space with lots of players, they just happened to have large market share. They weren't doing anything anticompetitive, and there wasn't any barrier to entry beyond 'You have to do it better than Google, and get your name out there'.