How much time? Because the way free speech absolutists talk about these ideas always seem to imply that we are mere moments from a country like Germany collapsing into authoritarianism. What evidence do we have that the US's level of free speech is truly better than a country like Germany which does specifically restrict the speech of Nazis?
The internet has created a global town square where the loudest voices are the ones that catch people’s attention, regardless of the veracity of their claims. There is no truth any more, only the cult of personality.
Tomorrow the US installs a racist, rapist, treasonous kleptocrat as president because the majority of people are unable to think objectively and swallow his promises at face value, despite every indication that life will be immeasurably worse if you’re not a billionaire oligarch.
A lot of people see the culture shift and start posting less or leave, and then the ratio gets worse and worse. Freedom from government restriction of speech is a good thing, but I disagree that this new era calls for throwing out norms of discussion platforms curating their communities' cultures.
I fully acknowledge there are valid, interesting philosophical reasons to host a site like Twitter or 8chan where "if it's legal it's allowed", but on net I think the benefits do not outweigh the costs.
*(Even many 4chan boards are less obnoxious. In part due to its linear format.)
Populations being persuaded into harbouring extremely bad ideas is a thing.