The only true monopolies are those backed by the government, which the original AT&T was. There has never been a "monopoly" not backed by the government that did not benefit the customer. Standard Oil and U.S. Steel, the classic examples always used, both drove down prices and increased supply for the market. By the time the government took action both had lost significant market share already as competition improved.
The only ones on your list that create problems would be Comcast and Verizon (assuming not wireless) as they are granted local monopolies by local municipalities and governments through right of way access to utility poles, etc. Breaking up the others, as you are suggesting, would only harm consumers.
The only ones on your list that create problems would be Comcast and Verizon (assuming not wireless) as they are granted local monopolies by local municipalities and governments through right of way access to utility poles, etc. Breaking up the others, as you are suggesting, would only harm consumers.