This is absolutely true, entrenched monopolies, or even a group a companies which have long since decided to stop competing with each other (e.g. canadian banks

This is absolutely true, entrenched monopolies, or even a group a companies which have long since decided to stop competing with each other (e.g. canadian banks and phone companies) begin to charge more for less over time. Some of this is intentional too, like the way cities artificially limit the number of taxi licenses. Disruption can be good, but it only gives temporary improvements as a new monopoly will eventually take hold. It's a fundamental feature of the capitalist market system that over time industries consolidate into monopolies (or groups that act like a monopolies) because that's the best way to maximum profits.