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

No freedom is absolute.

False advertising

HIPAA violations

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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:

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.

‘Death Stranding 2’ is Hideo Kojima at the peak of his powers - The Washington Post

Trade secrets

Revenge porn

And much, much more.

Obituary for Alan A Hines - holcombefuneralhomes.com

Perjury

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.

Fraud

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Terroristic threats

Insurrection

Insider trading

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Conspiracy

Threats of violence

Revealing classified information

Trivago watched its revenue forecast plummet from $1 billion to nearly zero—so the company tapped a set of former interns to turn it around - Fortune

Child pornography

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.