When someone tells you that the Internet is a "natural" monopoly due to the costs of laying fiber, remember this:
"There is very strong competition, with no peering between many such companies (again requiring a lot of traffic to be routed through international routes) and not even access to another's fiber-optics infrastructure (leading to the existence, in some cases, of over 25 fiber optics cables on the same street, hanging from the same pole). As such many companies have two separate providers for basically the same services."
https://en.wikipedia.org/wiki/Internet_in_Romania
"There is very strong competition, with no peering between many such companies (again requiring a lot of traffic to be routed through international routes) and not even access to another's fiber-optics infrastructure (leading to the existence, in some cases, of over 25 fiber optics cables on the same street, hanging from the same pole). As such many companies have two separate providers for basically the same services."
https://en.wikipedia.org/wiki/Internet_in_Romania