The thing is Parler has First Amendment rights and Section 230 protections, too. ASW had a contract to provide them with services, which they arbitrarily terminated in violation of its terms for content which Parler did not generate. If they want to argue it was their right since their servers were being used to take down the content, then Amazon should have taken down the content, not acted in coordination with Apple and Google to destroy an entity, Parler, protected under Section 230 -- they were applying a standard of liability to Parler which is forbidden under Section 230 and acting as their own court in doing so.