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

No freedom is absolute.

Insurrection

Threats of violence

Is UnitedHealth a Millionaire Maker? - Yahoo Finance

Revenge porn

Terroristic threats

HIPAA violations

Are you happy with your life?

Fraud

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.

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.

Life-building molecules discovered in the disk of a young star - Earth.com

Conspiracy

Perjury

Revealing classified information

Scientists Uncover “Alien” Chemistry Under Earth’s Largest Lithium Deposits - SciTechDaily

Freedom of speech does not apply to:

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.

Insider trading

World No. 1 Jannik Sinner ousts Novak Djokovic from Roland Garros to set up title clash with defending champ Carlos Alcaraz - CNN

Trade secrets

False advertising

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.

Retinal prosthesis woven from tellurium nanowires partially restores vision in blind mice - Phys.org

And much, much more.

Child pornography