If freedom of speech is absolute, how come it's not applied for private spaces and for the Internet?

No freedom is absolute.

Insurrection

Fraud

Rikishi calls for WWE writers to be fired for botching Jey Uso’s world title run - Cageside Seats

You have freedom of speech. If I loan you my computer, I can tell you not to use it for certain things, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Revealing classified information

Revenge porn

Mysterious 'runner' dinosaur a sign there are more Jurassic secrets to unlock beneath western US - Live Science

Terroristic threats

You have freedom to travel. If I loan you my car, I can tell you not to take it out of town, because it’s mine, you have no right to use it, and if I give you permission to use it I can tell you what you can and can’t do with it.

Threats of violence

What the Texas food label law means for the rest of America - The Washington Post

False advertising

Insider trading

Freedom of speech does not apply to:

DF Weekly: Why would Microsoft "sideline" its next generation handheld? - Eurogamer

HIPAA violations

And much, much more.

That’s what it is. You have no right to use other people’s stuff. If people let you use their stuff, they can tell you how you can use it, and they can tell you to stop using it any time they want.

Naz Reid signing new five-year contract to stay with Timberwolves - Sports Illustrated

Conspiracy

Perjury

Child pornography

Meta’s Next Headset is Reportedly Thin, Powerful & Uses a Puck-style Compute Unit, Coming in 2026 - Road to VR

If you’re wondering why free speech doesn’t apply to the internet, it’s because you have no right to use other people’s stuff for free.

Trade secrets