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

Insurrection

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.

Towards topological quantum batteries: Theoretical framework addresses two long-standing challenges - Phys.org

Threats of violence

False advertising

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.

What are the signs that a guy wants to marry you but is afraid of commitment or does not want to get married at all?

Conspiracy

Child pornography

Revenge porn

Atheists claim that Earth is 10 billion years old, yet there are no fossils that old. What do you have to say for yourselves for lying?

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.

Revealing classified information

Perjury

Pregnant women warned against using weight-loss jabs - BBC

No freedom is absolute.

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.

Freedom of speech does not apply to:

Why do some people prefer watching movies than reading novels even if they are both based on the same source material (book)?

Terroristic threats

HIPAA violations

Insider trading

Long, dark 'streaks' spotted on Mars aren't what scientists thought - Live Science

Fraud

Trade secrets