The idea Parler is a "free speech" platform or "unbiased" is a lie, in actuality its just a "safe space" for far right provokers. Users have been reporting they're been banned for posting leftist content or for criticism of Parler itself.

If they were so concerned with "freedom" why would they have the following in their terms of use?

“Parler may remove any content and terminate your access to the Services at any time and for any reason.”