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

No freedom is absolute.

Revenge porn

And much, much more.

Flash floods kill 3 in West Virginia, several people missing after inches of rain fell in 30 minutes - CBS News

Threats of violence

Freedom of speech does not apply to:

False advertising

Investigative Reporters Sound the Alarm at Peabody Awards - Variety

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.

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.

Why are so many US conservatives in this day and age still against racial mixing? They won't say it in public, but they are still against the mixing between Blacks and whites? Why?

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.

Child pornography

Perjury

Dinosaur Fossils Unlock Clues to Cancer’s Ancient Origins - SciTechDaily

Terroristic threats

Insider trading

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.

Wow! The changeover from President Biden to VP Kamala Harris as candidate could not have been more successful in just 2 days! It was as if they had been planning it. Could they have planned it? Are you excited by the positive Democratic response?

Revealing classified information

Trade secrets

Insurrection

Have you ever accidentally found out that you were about to be fired?

Conspiracy

HIPAA violations