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

No freedom is absolute.

Revealing classified information

Trade secrets

Why is (n-1)(n+1)=n^2-1?

Conspiracy

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.

Revenge porn

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And much, much more.

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.

Threats of violence

Why do I randomly start sweating a lot in public (while waiting in line, in a new class, etc.) then start sweating more because I’m embarrassed that I’m sweating so much? Is this social anxiety?

Insurrection

Freedom of speech does not apply to:

False advertising

Putin's uncompromising demands emerge after the latest round of Russia-Ukraine peace talks - AP News

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.

Child pornography

HIPAA violations

What is a good comeback for when someone calls you flat?

Perjury

Terroristic threats

Fraud

Apple’s struggles to update Siri lead to investor concerns over AI strategy - Financial Times

Insider trading

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.