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.

Terroristic threats

Revealing classified information

Cognizant's CEO tells us his counterargument to the idea that AI will decimate entry-level white-collar jobs - Business Insider

Trade secrets

No freedom is absolute.

Revenge porn

What is something you want to "get off your chest"?

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.

HIPAA violations

Threats of violence

How do you get started in bestiality with a dog as a male?

Insider trading

Child pornography

Perjury

The dogs of Chernobyl may be evolving right before our eyes - Boy Genius Report

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.

Conspiracy

How do you relax?

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.

Insurrection

Broadcom Stock Falls Despite Earnings Beat From AI Chip Maker - Barron's

Freedom of speech does not apply to:

Fraud