When I look around, there are multiple businesses usually near each other that compete. Home Depot and Lowes, Walmart and Target, Burger King and McDonald’s. ATT/Verizon/Tmobile.

But it is possible that if you pay to build out an entirely new network to a place where Comcast has a monopoly, and the customers would rather pay Comcast $5 less than whatever the lowest price you can charge is, then you would see negative returns by paying to build that network (since the cost of building out a network like that is so astronomical, and Comcast obviously does not have to pay it so their COGS is much lower).