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As a corporation, Comcast obviously has a responsibility not to run an ad against itself. As a steward of the first ammendment rights--ostensibly bound in some way by the fact that municipal and city governments lease the public's right of ways for its cable--Comcast has an OBLIGATION to do so!
The reason we have this conundrum is the FCC's willingness to facilitate media consolidation, creating a situation in which Comcast is the only purveyor of television media in certain markets (where broadcast television is not an option, and where single cable contracts preclude competition).
This fight is a bit of a windmill, and an odd argument--asking a corporation to advise the public of its own malfeasance--but what better way to highlight the dangers of media consolidation?