Fox News is the most profitable cable network not because of ratings or ad revenue (or lack thereof on the latter) but because it is the most expensive network a cable provider can carry. Those carriage contracts are extremely lucrative and make any advertising boycott levied by MMFA, et. al, completely useless.
NewsNation runs with a fraction of the budget of Fox, and is able to get some blue-chip advertising as opposed to none with Fox. And even then, the carriage contracts for NewsNation is still what makes the most money.
Do you have actual proof this is the case? Show me facts and figures, or this is nothing more than a "dude, trust me" claim.