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

No freedom is absolute.

Trade secrets

Child pornography

What can be done to combat group stalking and harassment by an organized gang or society, particularly when they use universal sound weapons?

Insider trading

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.

Freedom of speech does not apply to:

Do Republicans want to ban books and decide what your kids can and can’t read?

Fraud

False advertising

Conspiracy

Why do people who were very kind and loving once become cold-hearted?

HIPAA violations

Perjury

Revenge porn

Why after 50 years of being straight do I constantly desire to suck cock?

Revealing classified information

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.

Insurrection

Stunning 'Solar Curtains' Phenomenon Revealed on The Sun in New Images - ScienceAlert

And much, much more.

Threats of violence

Terroristic threats

Does the National Health Service (NHS) in the United Kingdom diagnose rare conditions? If so, does it provide treatment for them as well?

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.

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.