3-4 companies in a market can exist and still have 1 company be a monopoly. There’s also the issue of renters not having the ability to switch carriers because

3-4 companies in a market can exist and still have 1 company be a monopoly. There’s also the issue of renters not having the ability to switch carriers because their landlords won’t let an alternate ISP install in their building. Then, if you want anything resembling high speed internet, your options are even more limited. Only 25% of zip codes in cities have more than 1 provider that provides >25mbps. So, companies can still behave like monopolies even if there’s more than 1 ISP in their region.