An important part of business is targeting your offering to the intended market -- it sounds like the intended market for Hallmark is not the same as the intended market for Great American Channel. If Hallmark content is so objectionable to its viewership that they lose all their viewers to Great American Channel, surely Hallmark will pivot, or go out of business.
Or do you think Ron Desantis has to pass a law forcing Hallmark to make the kind of content which the Great America Channel shows? Is that your solution here, a command economy for basic cable?