>>I mean, zero moderation is some kind of internet libertarian ideal, but there's plenty of examples out there what that looks like - 4chan, 'old' reddit, parler & co (which ironically censor a lot of stuff), all of the dark web, etc.
There is a couple of problem with this, first I see no problems at all with 4chan, old reddit, or parler. So using them as an example of something bad that should be banned is ridiculous, parler in peculiar was gaslite into a false narrative around 1/6 protests when in reality most of the communication, as stated by the FBI, where done via Facebook and other larger platforms not parler. Parler was the scape goat. Parler should fail for any number of reasons but not because of censorship, it is a terrible platform technoligically, it is terrible security posture, and various other usablity issue.
Then there is the unintended blowback this type of censorships leads to. Such as increased levels of echo chambers and extremism. Take for example the fall out from Backpage removal. Did it end trafficking, and prostitution. No, not by a long shot, it just make the criminals harder to catch, the victims harder to find, and made things more dangerous for legal age sex workers.. Good Job Government.