They knew what they signed up for. Maybe they didn't know that a coup would end up planned on their app in the public, but it was nakedly obvious to everyone that Parler was going to go the route of Gab or Voat. Those who didn't jump ship a long time ago decided that that wasn't a problem for them.

Their bigger issue is going to be the fact that their resumes will be radioactive going forward. Reputation harm is actually a real thing; if Uber engineers struggled to get new jobs after all those bombshells years ago, these people's careers are probably de-facto over.