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.

Fraud

Insurrection

Astronomers Just Discovered The Biggest Explosions Since The Big Bang - ScienceAlert

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.

Insider trading

Freedom of speech does not apply to:

Need a different reason to eat more fiber? How about microplastics? - The Seattle Times

Perjury

Child pornography

False advertising

Don’t be mad, Dana — Ilia Topuria is the face of the UFC, and that Paddy Pimblett fight is a blockbuster - Yahoo Sports

Revenge porn

Trade secrets

No freedom is absolute.

A 35-year-old Florida man booked more than 120 free flights by posing as a flight attendant - Fortune

Conspiracy

Revealing classified information

Threats of violence

Woke Writer Dan Wolken Calls Riley Gaines 'Uncivilized' For Addressing Simone Biles Apology - OutKick

HIPAA violations

Terroristic threats

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.

Nick Jonas Set As KISS Singer Paul Stanley In STX Movie ‘Shout It Out Loud’ - Deadline

And much, much more.

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.