Commentary Both Apple and Google have deplatformed Parler, a social media app widely used as an alternative channel for group communication. Amazon soon joined this effort by denying access to cloud services hosting Parler content. Other service providers apparently followed suit, constricting and perhaps exterminating Parler from among the options available to consumers. Parler was offline for over a week, until it eventually found a new platform, albeit one deprived of the convenient access allowed by apps. Parler users have also effectively been cancelled, regardless of their actual posting conduct, based on a professed concern about violent discourse on the site. Anyone who doubts that the large tech platforms have market power should take notice. Although competition provides alternatives in the long run, concentration within channels for app distribution and cloud hosting allowed Parler’s operations to be disrupted. In addition, competition in the marketplace of ideas became a little less …