To me, the only hardline stance we can take against censorship is to keep (or return to) the internet decentralized as much as possible. Whenever Facebook or Amazon or Twitter or Youtube start censoring, somebody (who inevitably agrees with this specific instance of censorship) will insist "they're a private company, they can do whatever they want!" And this is absolutely, completely, totally correct and appropriate. What the rest of us have to do is to make sure that
another private company can compete with them. The problem is, all of the ISPs that make up the internet backbone are
also private companies that can do whatever they want. As soon as they agree to collude to stop routing traffic from, say Parler, the way AWS did when it threatened Twitter - as is their legal right as private organizations - the internet has effectively become a monopoly.
Fortunately, the internet protocols themselves are open, at least until Google takes full control of the internet and classifies the IETF publications.