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

And much, much more.

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.

No freedom is absolute.

Bed Bugs May Be the First Human Pest, Evolving Alongside Us Since Neanderthal Times - Indian Defence Review

Insider trading

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.

Perjury

Have you ever met someone and something seemed so unusual about them but you couldn't put your finger on what it was?

Revenge porn

Revealing classified information

Terroristic threats

Bristol Myers Joins Race for New Class of Cancer Drugs With BioNTech Deal - Barron's

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.

Insurrection

HIPAA violations

Ancient Protein Breaks Biological Rules by Working in a Mirror World - SciTechDaily

Freedom of speech does not apply to:

Trade secrets

Threats of violence

Apple’s leaked 45W MagSafe charger is first to support Qi2.2 - The Verge

Child pornography

False advertising

Fraud

How can a man clean his Soul?

Conspiracy

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.