·Time Warner Cable
There's very little substantive difference between private and government when it comes to natural monopolies like broadband. Comcast could charge whatever they want, but $10 a month sounds appealing (I guess) for low income people and their poverty pimps. The fact remains it's just another revenue stream for Comcast, and sending propaganda about their services home with school kids is really just unconscionable behavior.
Supply and demand: make the service available, advertise it like you would anything else, and people who want/need it will sign up. Besides, "low income" people always seem to find a way to afford a smartphone (especially in a place like Chicago), so they're probably either tethering or using their phone Internet as their primary Internet source to begin with.