Regardless of my/your thoughts on Parler, godspeed to those engineers. Assuming a majority of Parler infra is hosted on AWS, and it wasn't built to be multi-cloud, moving hosting providers in ~36 hours seems like a herculean task.
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.
You make a very bold assumption that none of the ~75 million Trump voters in the US are in tech hiring positions.