Downvotes seem unwarranted, this is the definition of "predatory pricing", which is just a company using the profits from one business to undercut in another with the intent of forcing competitors out of business.

Though I don't know that it really applies here - they're unlikely to drive TWC-Comcast out of business by pricing low in just a few areas. It's more of a concern when it's a large monopolistic company doing it to regional competitors to maintain their monopoly.