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Lots of cities go down this path to offer their own broadband. My hometown even provided basic cable access. They f'ed that up pretty badly, losing millions of taxpayer dollars in the process.

Years later they decided to try again with fiber. Once again, they f'ed that up pretty badly, losing millions of taxpayer dollars in the process.

They eventually gave up and handed the whole thing over to Google. That went fairly well. Comcast (cable) and CenturyLink (dsl) both started offering higher speeds for less. Everyone won.

Merely offering an alternative isn't any good. Offering an alternative that is at least as good, and preferably better, is required to actually cause the existing powers that be to compete.