Yet you're making one.
> the Internet cannot actually be a complete free for all
Yet in many important ways, it is.
As much as publishers would like to shut down Scihub, it exists. The Pirate Bay famously persists. Nation states with entirely opposed legal systems connect and interoperate to at least some degree.
The OP said: "Extremely depraved things are not the only thing to use freedom of speech for, and freely speaking can result in all kinds of repressions."
Which is objectively true.
You're throwing reporters, political dissidents, whistleblowers, minority groups, and just regular people who don't appreciate the Stasi in with the child pornographers which some might take as an insult and offense.
What kind of criminal does Phil Zimmermann look like to you? We had this argument already in the 90s.