Your first example, Google, is a model where participation is controlled by a rigorous interview process and at-will employment afterwards, and whose subsystems, such as buses and cafeteria food are subsidized by advertising revenue.
To replace, say, LA transit, with Googlebus will similarly require a phone screen and a five-hour interview just to get the rider badge, and then regular productivity reviews.
Google knows a lot more about you than you think they do. With intelligent agents, and your permission, they could do the equivalent with software. As it is, they soon will anyway, which is the down side.