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

Freedom of speech does not apply to:

HIPAA violations

Revealing classified information

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Perjury

And much, much more.

Conspiracy

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Insurrection

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

What are "the new net zero jobs of tomorrow" that SNP's Stephen Flynn says his party would create?

No freedom is absolute.

Trade secrets

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.

In England, there's a small city called York which was named after New York. Why wasn't London, the largest city in England, named after New York? Why York?

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.

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.

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Insider trading

Terroristic threats

Fraud

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Threats of violence

Revenge porn