The blackouts are because a broadcast station in that area is showing the game. Under FCC regulations DTVV or now You Tube cannot have that game on the Ticket. It is not the NFL that makes the decision.
Is that FCC or is it the way the contract rights are set-up?
I always thought that the Ticket can't show the games on the subscriber's local TV network broadcasts because those broadcasts are covered under the NFL's main, primary network broadcast rights package that CBS and FOX have paid handsomely for and that local viewers can receive through either a tv provider or even over the air.
The Sunday Ticket is only for "out of market" games, and the rights package expressly prohibits the Ticket package from including the games that are on the subscriber's local market tv . . . so Sunday Ticket is contractually obligated to "black out" those games - meaning that you can't watch them on the Ticket because you're supposed to be watching it on your local network feed.
I didn't think the FCC had anything to do with it, but I haven't really researched that.