One problem I have with the Nazi Bar framing - or perhaps, how people read it - is that it assumes the behavior is accidental. That is, that the sites that have become Nazi bars did so purely out of a misguided sense of free speech absolutism that has been abused.
In practice, most Nazi bars are run by people actively choosing to kick people out: just the ones wearing the trans pride buttons instead of the ones wearing iron crosses. The kinds of online spaces run by free speech nutters or moderators asleep at the wheel tend to devolve into calling everything cringe, including the Nazis. Actually, Nazis are a particularly easy target for trolling and harassment, both because it is never unethical to laugh at Nazis and because critique makes them jump off the deep end.
During the Jack Dorsey era of Twitter, Twitter was a dive bar. Problematic users rarely got removed off platform, neither left nor right[0]. If people did get banned, it was for egregious offenses even Twitter management couldn't excuse. When Musk bought it, he changed it into a Nazi bar, making sure him and his favored far-right commentators got all the algorithmic boosts while left-wingers got shadowbanned.
Same with all the right-wing communities that forked out of Reddit. /r/The_Donald, Voat, etc. I bet you $10 they all had active policies to ban or bury left-wing content while actively screaming their heads off about "freedom of speech".
And there's a parallel with the actual rise of Hitler as well. I think a lot of Americans have this incorrect picture of a stupendously angry and racist German public, all voting in a landslide for the state-sponsored murder of six million Jews. The reality is that the people who owned the bar - both in Germany and abroad - were rallying behind Hitler since day one, in ways that persisted even beyond the fall of the Nazi state. They're the bits of the deep state[1] that ensured Hitler's insurrection against the Weimar Republic was given a light sentence and that Americans were kept in the dark about the nature of the Holocaust until it was undeniable. Nobody ever actually voted Hitler into office. He took advantage of a technicality and a frightened owner class to seize power for himself.
Yes, it is true that Nazis are malware[2]. Yes, Nazis can independently worm their way into a system and ruin it. However, more often than not, the people who own the Nazi bar don't merely tolerate Nazis, they accept and embrace them.
[0] Before you mention Donald Trump's ban in 2021, keep in mind Twitter had made a policy specifically to justify keeping Donald Trump on platform even when he was breaking rules.
[1] Informal ruling hierarchy parallel to the formalized one we vote for. This term usually also alleges that the informal hierarchy has subverted the formal one; but I'd argue that's almost never necessary for a deep state to exist. All states start deep, formal hierarchy is a transparency mechanism to make it shallow.
See also https://xkcd.com/898/
[2] Fun fact: if you fine-tune an AI to write malicious code unprompted, it becomes a Nazi. See https://www.emergent-misalignment.com/