Thanks so much to James Valliant for finding this quotation. I promise to link to the podcast in which you discussed it yesterday--just as soon as Ayn Rand Center UK posts it on BitChute :)
http://aynrandlexicon.com/lexicon/censorship.html
As for the writings in which Benjamin and I have discussed this sort of phenomenon, in the last 2-1/2 years, first is my blog post from January 2021, soon after Parler was unjustly scapegoated and deplatformed:
https://dontletitgo.com/2021/01/17/section-230-the-third-party-doctrine-and-the-looming-dark-age/
And then, several months later, Benjamin and I published this piece in Real Clear Policy, focusing on the merits (normative and legal) of a case such as the one Trump brought against Twitter:
https://www.realclearpolicy.com/articles/2021/08/05/can_trumps_lawsuits_prevent_big_tech_from_becoming_big_brother_788617.html
Oh, and here's the MSNBC story I mentioned, re: Parler and Facebook:
https://www.msnbc.com/the-reidout/watch/facebook-parler-reportedly-gave-advance-warning-to-government-officials-about-jan-6-139404357583
If you like this content, be sure to subscribe to my channel!