The reality of the situation for the broadcast networks is this: "Free OTA distribution is a legacy system that's always been there and it's not something we can easily walk away from. Ideally, no one would watch our content for free via OTA but instead they'd subscribe to us via a multichannel pay TV (i.e. "cable TV") package, or through our own direct-to-consumer streaming service. Because that way, we're getting some amount of subscription fee passed onto us from viewers, in addition to the ad revenue we make. Yes, if you're not going to PAY to watch our channel, then we'd rather have you watch us for free via OTA because you're at least bumping up our ad revenue that way."
Now think about that situation and decide if you believe it's in ABC, CBS and NBC's best interests (from a profit-maximization perspective) to expand free access to their live broadcasts. ABC has Hulu. CBS has CBS All Access. NBC has Xfinity TV plus an OTT competitor to Hulu launching in 2020. And all of them still gets LOTS of reverse retrans comp paid to them from their local affiliates (the largest of which they actually own outright).
So OF COURSE those networks don't like the idea of folks conveniently launching the Locast app to watch their broadcasts for free. If cord-cutters want to conveniently stream that stuff at home or on-the-go, they should get Hulu, CBS AA, YouTube TV, PS Vue, etc. and actually PAY for it! If they insist on free, well then, they're going to have to deal with the hassle of an antenna and iffy reception (thanks, ATSC 1.0) and watch on their living room TV! And if they want to watch that stuff when they want, they'll have to fool with the expense and bother of an OTA DVR (which, let's be honest, is and always will be for a certain niche breed of consumer).
So what does this portend for the next-gen OTA standard, ATSC 3.0, which promises not only better picture and sound quality, but also easier, more reliable reception, including in cars and even perhaps on phones? It's not surprising, is it, that the biggest cheerleaders for ATSC 3.0 are the owners of local broadcast stations -- Sinclair, Nexstar, etc. -- who do not own any significant content (just local news, really). We hear very little at all from the big 4 networks about ATSC 3.0. Yes, they've made small indications that they may support it but you can understand why they're not enthusiastic about it. Why encourage more FREE consumption of the popular content which they expect to get PAID for?
I'm not surprised at all that neither the networks nor the broadcasters are in favor of expanding the OTA reach by whatever means. What does amaze me though, is that with all the high priced lawyers they have at their command they have not yet found a legal basis for taking SFCNY/Locast to court in an attempt to shut them down. With Locast already available to almost a third of the viewing public, if they had anything they thought was winnable ammunition, I expect they'd have lit the fuse by now...