I agree with most of the article, but the author faltered in the area I predicted he would before I began to read. He expresses fear that without some restraint that sites might become "like 8chan". To which I have to ask, why is that a problem? Because its a hotbed for hate speech? What is hate speech? I'm sure I dont need to elaborate further on what I see wrong with that. What people seem to forget/ignore is that…
Is https://en.wikipedia.org/wiki/Paradox_of_tolerance relevant here? Also, if you ask for (legal) spaces for "anything goes" content, you need to campaign not just against "hate speech" laws, but all the other laws that prohibit various kinds of information.
In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols. We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.
The claim isn't that we should denounce those who hold opinions we find abhorrent as intolerant and fail to tolerate them; it's more specific than that, it says that we may need to physically fight those whose 'opinions' are backed by force or the credible threat of it.
I don't think vile, anonymous Internet racists rise to this measure. Your mileage may vary. Most of the Interneterati who invoke the paradox of tolerance are saying that, e.g., being intolerant of the LGBTQ, or racially chauvinist, or less than enthusiastically feminist, is grounds for censorship and deplatforming.
I don't agree, and don't get the impression Karl Popper would either.