What is a natural monopoly depends on government regulation. In particular regulations granting access from one company's system to another's can stop natural monopolies from being natural monopolies.

A simple example is that the pattern of long thin property rights needed to create a railway system completely blocks anyone from creating criss-crossing railroads that would allow them to compete. But government rules forcing the initial company to allow competitors to cross or share its railways will create competition.

Forced access to long distance telephone networks has the same effect.

No, they are good because they are not forced ones. Like google, anyone could use any other search engine, like I do using duckduckgo. If people use google, it's because they think it's very good and they don't find something that is so much better that they'd leave.

Natural monopolies are just as bad if they exploit their monopoly, which they will certainly do if they’re left to their own devices.