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

No freedom is absolute.

Child pornography

Fraud

BlackRock removed from Texas blacklist after climate policy rollback - Financial Times

Insurrection

Freedom of speech does not apply to:

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.

Rem dolor autem consequatur assumenda magnam.

Insider trading

Trade secrets

Threats of violence

Why do I keep dreaming of my mom, who recently passed away from cancer, still being sick and in pain?

Revenge porn

Conspiracy

HIPAA violations

Laws of physics are still broken: Attempt to explain away black holes' central singularity falls short, scientist says - Space

Terroristic threats

False advertising

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.

Can I use Amazon Alexa Claude AI on my Echo device?

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.

And much, much more.

Revealing classified information

According to Trump, Ukraine started the war. Why?

Perjury

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.