Free speech absolutism is not practical. Platforms like HN, Twitter, Facebook or Reddit would be quite hostile, it's like letting people out in the streets doing whatever they want. That's not practical.

The irony is that mainstream platforms tend to censor responsibly (even if false positives tend to occur due to the use of bots), while free speech absolutist platforms like Parler would ban you for merely having a different opinion.

The other irony is that free speech absolutists are responsible for nearly all the terror attacks in the United States. The harmful ideas of these absolutists are rejected by society for a reason, but this was the case even before the internet. Freedom of speech is not freedom of consequences.