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

And much, much more.

Conspiracy

False advertising

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Terroristic threats

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.

Revenge porn

How do flat Earthers explain the existence of other spherical planets?

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.

Revealing classified information

No freedom is absolute.

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Fraud

Insider trading

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.

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Freedom of speech does not apply to:

Threats of violence

Insurrection

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Child pornography

Perjury

Trade secrets

Do flat Earthers really exist? Why do they believe the Earth is flat?

HIPAA violations

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.