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

Revenge porn

Perjury

Insider trading

How or where can I get any kind of books online for free?

Freedom of speech does not apply to:

Terroristic threats

HIPAA violations

9 Things Women’s Health Doctors Would Never Do - HuffPost

Trade secrets

Threats of violence

Insurrection

Microsoft’s Bad News—500 Million Windows Users Must Now Decide - Forbes

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.

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.

False advertising

Trump travel ban rattles immigrant communities across U.S. - The Washington Post

Conspiracy

Fraud

Child pornography

Social Security is making payments of $2,000 on average on Wednesday, June 18: find out who gets a check - Diario AS

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.

No freedom is absolute.

How Can AI Researchers Save Energy? By Going Backward. - Quanta Magazine

Revealing classified information

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.