None of these people have been banned from the major platforms though, and as far as I can tell all of them are still active on the majors. Parler is thus only

None of these people have been banned from the major platforms though, and as far as I can tell all of them are still active on the majors. Parler is thus only one of many social networks that they use, and likely not the one with the most reach. So deplatforming them from the majors would have an effect.