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.

Perjury

False advertising

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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.

Revealing classified information

Rory McIlroy explains frequently skipping media availability: ‘I feel I have earned the right to do whatever I want’ - Awful Announcing

No freedom is absolute.

Fraud

Freedom of speech does not apply to:

What's a joke you haven't used yet, but are dying to share?

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.

Threats of violence

Insider trading

U.S. FDA Approves Merck’s ENFLONSIA™ (clesrovimab-cfor) for Prevention of Respiratory Syncytial Virus (RSV) Lower Respiratory Tract Disease in Infants Born During or Entering Their First RSV Season - Merck.com

HIPAA violations

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.

Conspiracy

CNBC Daily Open: Elon Musk's companies report positive developments amid his return to work - CNBC

Child pornography

Insurrection

Revenge porn

Inzaghi uncertain on Inter future after humiliating 5-0 Final: ‘We’ll see over next few days’ - Football Italia

Terroristic threats

Trade secrets