Because you have a limited amount of companies providing any given service, those companies can easily collude and lobby and do whatever the hell they want with their businesses, such as slowing traffic and charging for certain sites.
You have limited choices because local municipalities form contractual monopolies with companies to institute a one and only one option system for utilities. You have governments creating a problem and then trying to solve their own problem by enforcing price ceilings on the products; which then makes it highly unprofitable to be in the business that the company is in. How does that make an sense in the slightest? If I were comcast or Verizon or whatever I would say screw it, we're no longer over internet access.