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.

Child pornography

Terroristic threats

Important scientific finding confirms ancient biblical events - The Brighter Side of News

No freedom is absolute.

Revenge porn

Threats of violence

Where can Ukrainians go if they cannot have shelter and heating this winter?

Perjury

Trade secrets

Conspiracy

I'm British and feel ashamed of the crimes of British colonialism. What should I do?

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.

Fraud

HIPAA violations

If the world was flat, would it be possible to see Mount Everest if it was on the other side of the Earth on a clear sunny day?

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

False advertising

Utah health officials monitoring potential measles exposure in southwestern Utah - KSL.com

Freedom of speech does not apply to:

And much, much more.

Insider trading

As a woman, what would be you response to a male friend’s offer of a full body massage?

Revealing classified information

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.