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.

And much, much more.

Perjury

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False advertising

Conspiracy

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.

The GLP-1 Weight Loss Drug Ozempic Is Reportedly Giving Men A Lot To Brag About, Down Under - Wccftech

Trade secrets

No freedom is absolute.

Child pornography

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Insurrection

Terroristic threats

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.

Nintendo Switch 2 hackers say they’re already getting banned - Polygon

HIPAA violations

Freedom of speech does not apply to:

Fraud

SpaceX launches latest GPS III satellite for U.S. military - SpaceNews

Revenge porn

Insider trading

Revealing classified information

President Xi Jinping Speaks with U.S. President Donald J. Trump on the Phone - fmprc.gov.cn

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.

Threats of violence