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

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.

Terroristic threats

How do you get people to follow your Quora Space?

False advertising

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

What do you wear when you are alone at home?

Freedom of speech does not apply to:

Conspiracy

Revenge porn

Is it possible to permanently quit pornography?

Insurrection

Revealing classified information

Insider trading

What is the more common way to say "you're welcome" in French: “De rien” or “Pas de problème”?

And much, much more.

No freedom is absolute.

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.

Simulation reveals emergence of jet from binary neutron star merger followed by black hole formation - Phys.org

HIPAA violations

Child pornography

Perjury

Where Seattle Mariners stand in All-Star voting - Seattle Sports

Trade secrets

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.