If it was illegally parked, couldn't they just call the police to ticket the bus? If the city has chosen to allow the buses to use the Muni stops then the fight should be with the regulators/city not with Google. For example, in the Mission, you're allowed to park in the middle of the street on Sundays because of the need to accommodate churchgoers. This seems like another application of special rules that "common citizens" cannot normally do.

At the end of the day though, the bus protest is not really about the bus but about the overall situation with housing, power, and inequality.