Private businesses are never considered “public square”. Neither the NY Times nor Facebook is in any way obligated to publish anything and everything you want to on their platforms. Nor offline is a private business required to allow you to speak on their property. They all can choose to block any and all content they feel like, whether it be WordPress with a lower case P or calls for violence.

That’s not to say folks haven’t argued the opposite, just that it’s never held up in court.

These businesses are still subject to a lot of equal protection and non-discrimination requirements around access, but that is always deemed very different than unrestrained use.

Here’s a nice summary https://www.talksonlaw.com/briefs/does-the-first-amendment-require-social-media-platforms-to-grant-access-to-all-users

The .org plugin directory should continue to curate the plugins listed there (perhaps even more than they currently do).