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

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.

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.

Threats of violence

Le Mans 24 Hours: Kubica wins with Ferrari as Porsche spoils 1-2-3 - Autosport

No freedom is absolute.

False advertising

Terroristic threats

Your ketchup will see you now: Solid-phase properties reveal when yield stress fluids start to flow - Phys.org

Insider trading

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.

Perjury

What does pompano fish taste like?

HIPAA violations

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.

Insurrection

Why are there so many girls and not enough boys to follow?

Fraud

Revealing classified information

Conspiracy

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And much, much more.

Revenge porn

Freedom of speech does not apply to:

Do you think the number of sissies is on the rise?

Trade secrets

Child pornography