An anonymous reader writes "Regional ISP Charter Communications is fighting back against the potential merger between Time Warner Cable and Comcast. Charter had been bidding for TWC before Comcast got involved, and now they're urging shareholders to reject the deal. 'From the regulatory perspective, it is difficult to imagine a transaction that could concentrate the industry more than the proposed Comcast merger,' they said in an SEC filing. James Stewart with the NY Times explains what Comcast would look like if the merger continues — when you add the TWC deal to the NBCUniversal pickup a few years ago, Comcast is starting to resemble a global tech company. He also explains why the deal isn't setting off antitrust alarm bells: 'Time Warner Cable operates in 29 states, but thanks to the old system of regional and municipal cable monopolies, Comcast and Time Warner Cable don't compete anywhere. Justice Department merger guidelines define geographical markets, which is why regulators weighing airline mergers examine competition on individual routes, not national market share. ... Under conventional antitrust standards, it's pretty much an open-and-shut case.'"