I recommend you actually read up on natural monopolies. It's a well understood and universally accepted phenomenon (at least academically; obviously there are vested interests who prefer to deny their existence despite clear facts).
Every time people show me a "natural" monopoly I find regulations around it that corrupt the market.
People believing in the so-called natural monopolies lack fate in the entrepreneurial drive, creativity and innovation of the free individuals working hard in their own interest, for their own betterment.
