For YoutubeTV, which I have, it is included in the service. My understanding is that ESPN charges based on whether there is an ACC team in the market or not. It is much higher if there is a team in the market.
For Xfinity I found the following on Google:
That indicates that ACCN gets nothing if the subscriber is out of an ACC market and subscribes to the starter package. (which few people do I believe) If you are out of market, it is included in the packages that the great majority of people get.
My understanding from reports, although the TV distribution contracts are all non-public, is that the rates are negotiated as in-market and out-of-market rates. When the SEC Network first started the reports were that cable/sat companies were paying about 30-40 cents for the network out of market, but paying $1.30-1.40 in market. When the SEC added Texas A&M, the SECN revenue jumped by 5-10 million per month for the state of Texas. If the ACC were to add SMU, I expect that the ACCN revenue would have a similar bump, maybe not as high. Adding Stanford or Cal should have a bump for the Northern California area. That money wouldn't all go directly to the ACC because the network is a partnership and the costs would likely increase with the larger footprint to manage/cover.
That is the reason I have said that markets still matter monetarily at this point. The Big10 moving in the Southern California means that cable, sat, and streaming broadcast services like YoutubeTV will pay more for the Big10 Network per subscriber in an area with a very large TV base. That would happen in Atlanta or in Miami. Rutgers had that kind of bump for them in NY, but that bump was very large. I have seen reports that the Big10 Network revenue in the NY area was larger than the yearly Big10 media payouts. In other words, Rutgers brought more money into the Big10 than they were paid out of the Big10. That happened even though Rutgers hasn't been a very good team and hasn't been a highly viewed team. The financial aspects are a lot more complicated than simply highly rated games equals the most money for the conference.