I don't understand this "free market always wins" argument. What if all companies agree on throttling a particular service like bittorent? What if all competito

I don't understand this "free market always wins" argument. What if all companies agree on throttling a particular service like bittorent? What if all competitors are too expensive for me to choose them and my competitor is throttling a majority of the internet? What if I'm already in a 2 years plan and cannot leave my service without paying some extra? Do these reasons give my service right to intervene in my internet experience?