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

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.

Insurrection

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.

Guy Hears Cries During Hailstorm — Then Saves An Entire Family - The Dodo - For Animal People

Revenge porn

Child pornography

Revealing classified information

She was a Disney star with platinum records, but Bridgit Mendler gave it up to change the world - Ars Technica

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.

Fraud

Terroristic threats

Honestly! Do you people actually watch all that nonsense produced by the nitwit network television stations or do they just claim you do?

HIPAA violations

No freedom is absolute.

Conspiracy

YieldMax® ETFs Announces Distributions on XYZY, WNTR, SMCY, AIYY, MSTY, and Others - GlobeNewswire

False advertising

Trade secrets

And much, much more.

3 No-Brainer AI Stocks to Buy Right Now - Yahoo Finance

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.

Freedom of speech does not apply to:

Insider trading

AI Cracks Secret Language of Sticky Proteins Linked to Alzheimer’s - SciTechDaily

Perjury

Threats of violence