What's your working definition of "mainstream news outlet"? I can't think of a reasonable one that precludes them from broadening their reach. And given their size, they are more likely to have the resources to do so.
Also, there are large populations where network monitoring and/or content restrictions are part of everyday life. The New York Times experienced this directly with respect to their iOS app in China.
https://www.nytimes.com/2017/01/04/business/media/new-york-t...
Edit to add: To turn it around, why shouldn't the NYT do this? That isn't snark: I'm interested in hearing substantial reasons for the skepticism implicit in 'pbarnes_1 original question. Granted, I haven't read all of the comments for this submission, I haven't seen any that convincingly argue this isn't a useful thing.