Networks don’t have broadcast licenses. Any restraint on their part is forced by the market. Channels like MSNBC don’t have market restraints because they are unacknowledged donations to the RNC by NBCUniversal.
Only a couple of broadcasters in history have lost FCC licenses, both over racial segregation, I think.
“Networks don’t have broadcast licenses.”
I thought some networks owned a few broadcast stations serving major cities. I’m not at all sure though.