AMC is basically trying to act like it's Disney+ or Netflix, or whatever you prefer, for its own content. Their issue is just that the stuff from them people actually want to see in big numbers is more or less that list you mentioned. They don't actually control Breaking Bad, Mad Men or Better Call Saul. The Walking Dead and Fear the Walking Dead seem to be on legacy contracts that give all the "back" seasons to Netflix and Hulu, respectively.

They haven't had anything new that people actually care about enough to notice its exclusivity. The newer Walking Dead spinoffs would be about it, I guess.