Something interesting here is that not only the Parler app was pulled... the _entire_ parlor.com domain and website registration is non-existent at the moment. It's like a black hole:
>dig @1.1.1.1 parler.com +short <empty>
>dig @1.1.1.1 parler.com +short <empty>
So I guess at some point, Dreamhost as a registrar silently deleted them. Now, even if Parler wanted to move somewhere, they would have to regain control of their domain from Dreamhost.