For the same reason any accumulation of capital allows bad ideas to hang around. You can operate at a temporary loss to weed out new competitors, you can intimi

For the same reason any accumulation of capital allows bad ideas to hang around. You can operate at a temporary loss to weed out new competitors, you can intimidate newcomers with frivolous legal action, you can leverage network effects, you can lobby for regulation that makes it hard for competitors to start up...