Was Parler inevitable?

How the giants' self-regulation created a market opportunity

(Olivier Douliery / AFP)

The apparent breakout success of Parler continued to draw attention over the weekend, as the upstart conservative-friendly social network attracted millions of users and raised the prospect that it could be here to stay. (At press time, it’s the No. 8 free app in the iOS App Store.) Last week I wrote about the challenges Parler f…