There's a big difference between not using one out of fifty competing social media apps and not using the products from an illegal duopoly. The first is freedom

There's a big difference between not using one out of fifty competing social media apps and not using the products from an illegal duopoly. The first is freedom of choice, the second is a lack of choice enabled by illegal business practices that prevent competition through violation of antitrust laws. So you are literally free to choose to use Facebook or not, but if you want to participate in society, use banks, get a job, etc, you are not free to escape the Apple and Google duopoly, because their illegal anticompetitive actions have artificially limited consumer choice.