I mean, nobody intrinsically cares how many competitors there are, so long as the all content can be retrieved from a single source. Of course that doesn’t mean people wouldn’t care if a single company were to abuse their monopoly e.g. by charging unreasonable rates or forcing ads (looking at you, cable).

It’s worth remembering that monopolies aren’t inherently illegal in the U.S. or anywhere else really; it’s not against the law to have the best product by a mile, nor should it be. Antitrust is illegal, which in this case would be defined by signing exclusive rights for all content and then providing a shitty service.