Going by your definition, does Apple have a monopoly on phones since every other phone is inferior? Just because one broadband provider has greater speeds than the others, it doesn't mean it has a 'broadband monopoly'. Again most Americans don't need 100Mbps+. They are fine with 25Mbps. Netflix only requires 3Mbps.
Now the "cable monopoly" is a separate issue entirely. Comcast has superior speed in some areas because the municipalities create bottlenecks that keep new wires from being laid (like charging exorbitant fees to do so). See, http://www.wired.com/2013/07/we-need-to-stop-focusing-on-jus...
Why don't they count? AT&T and Verizon are also broadband providers. They're not dial up services. Isn't that the definition of broadband? The cell providers are listed under "Advertised Speeds Above 3 Mbps Data" or above. Just because Comcast has the fastest service doesn't mean it has a monopoly on broadband services. The vast majority of the American population don't need 100Mbps+ anyway. If they did, there would be more competition in that market.
Now the "cable monopoly" is a separate issue entirely. Comcast has superior speed in some areas because the municipalities create bottlenecks that keep new wires from being laid (like charging exorbitant fees to do so). See, http://www.wired.com/2013/07/we-need-to-stop-focusing-on-jus...