The problem for OTA affiliates/broadcasters is content. Their business model relies on getting eyeballs so they can justify what they charge for advertising. Creating content that your viewers actually want to watch is expensive.

Aside from some of the larger PBS stations, I don’t know that any of the major broadcasters, like Sinclair, have any experience producing their own content. They can throw their little tantrum and refuse to air Kimmel, but that’s just going to hurt them in the short term as advertisers will decide OTA timeslots are not a good investment.