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

Freedom of speech does not apply to:

Child pornography

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.

Unannounced And Petty: Southwest Fired Their Skycaps, Now Charges $3 To Check Bags At The Curb—After Saying They Wouldn’t - View from the Wing

Insurrection

Fraud

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.

Yankees get completely manhandled by Dodgers in ghastly blowout loss - New York Post

Threats of violence

Perjury

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.

Discovery of 100-million-year-old dinosaur eggs reveals life in Jurassic America - Earth.com

And much, much more.

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.

Warming climate may flip the script on the amount of CO₂ released by trees, study finds - Phys.org

Conspiracy

Revenge porn

Revealing classified information

Long, dark 'streaks' spotted on Mars aren't what scientists thought - Live Science

No freedom is absolute.

HIPAA violations

Insider trading

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Trade secrets

False advertising