Are you sure that the "Internet is a natural monopoly" people were actually people and not just bots and shills? The only reason I could see real people wanting a monopoly would be if they were pushing for the government to handle the infrastructure and then lease out access to whoever wants to offer services over the lines. There's a case that it doesn't make sense to have 50 different companies all running physical cables everywhere. What doesn't make sense is only allowing one private company to do it and leaving yourself at their mercy.