That's like saying Google "just" aggregates indexed websites. I use justwatch on a weekly basis to find out whether a movie is on any of the services I use (instead of checking all three of them individually), and browse new releases on each service.
Sure. But OP was responding to the below excerpt. At least from the way I've interpreted the request, they are looking for a single interface to watch their content from multiple providers. justwatch does not do this.
px1999 1 hour ago [-]
Long term, we'll probably wind up with a couple of major marketplaces that provide a UI that ties together content bundles that you've purchased from different distributors (who will actually serve up their catalogs).