> It is a bad thing, because the law protects our disagreement with the election deniers/MAGA diehards only as much as it protects their disagreement with ours.

[Citation Needed]

I'll assume you mean the first amendment and that only applies to the government not to private business (i.e. Facebook). It definitely does not apply to a webpage that told you in their T&C that they're scanning the content you post.

The article may quote “Facebook provides the FBI with private conversations which are protected by the First Amendment without any subpoena.” but it wouldn't be worth the ink it's printed on. Time and time again it's been shown that if a third party (i.e. facebook) wants to willingly give information to the government a subpoena is not needed.