And yet you can go to Parler, and they will happily censor pro-left / Democrat / liberal posts and positions. And openly do so. And have the people there stating it as their right (which it is). So these right leaning people absolutely do have a platform.

Is it as popular? No. Maybe that's because their perspective is less popular. You don't have the right to an audience to your speech and it's not suppression to choose not to use my [or Facebook] resources to amplify your words, nor is it my problem that your platform doesn't have the same audience and reach.