Most people have 2 choices, and if they are lucky 3. Even if you have 4, that is definitionally an oligopoly. You don’t get good competitive results in those situations.. I have two choices, Comcast, and AT&T DSL. If I want more than ~7mbps, my only choice is Comcast. They can do almost anything, including block Netflix or Youtube, and I’d probably stick with them instead of downgrading to AT&T. That gives them tremendous power to extort Netflix and YouTube, and any up and coming entrepreneur.
I live in rural Oregon and I have over a half dozen choices. We just dumped CenturyLink for a smaller hungrier locally owned provider.