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.

Threats of violence

Trade secrets

Reds Sign Wade Miley, Place Hunter Greene On Injured List - MLB Trade Rumors

HIPAA violations

Insider trading

Revenge porn

UFC fighter rips opponent after seizure causes last-second main event cancellation: ‘She’s a complete mess’ - New York Post

And much, much more.

Fraud

Child pornography

Can you share a story of someone who had a lucky experience while hitchhiking?

Revealing classified information

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

Does eating bread before bed make you fat? If so, why?

Freedom of speech does not apply to:

No freedom is absolute.

Terroristic threats

What's wrong with white women?

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.

Conspiracy

Perjury

Senators get ready to roll out a new crypto bill - Politico

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.