In no city is the cable company actually a "locally granted monopoly." Every franchise agreement I've seen points out that it's non-exclusive.
Technologists have a fundamental misconception that leads to a lot of cognitive dissonance and confused reasoning: that building wireline infrastructure is a lucrative business that companies can't wait to get into, and would were it not for "regulatory capture" and legal roadblocks. But it's not. It's a business with large up-front costs, expensive maintenance costs, expensive unionized workforces, etc.
> Every wireless carrier is a monopoly-- because they all have monopoly powers over bands of spectrum the federal government sold to them
You're punning on the word "monopoly." Anyone who owns property has a "monopoly" over it. But that does not make them a monopoly. In most cities, you have 3-4 options for wireless service.
> Another utility that is highly regulated, engages in rent seeking and is, a monopoly over its area.
Most electric utilities are monopolies, because it's illegal to deploy competing electrical service.