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

And much, much more.

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.

Terroristic threats

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Insurrection

Perjury

Insider trading

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Freedom of speech does not apply to:

False advertising

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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HIPAA violations

Revealing classified information

Fraud

What is the reasoning behind conspiracy theorists claiming that there were multiple shooters involved in the JFK assassination?

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.

No freedom is absolute.

Child pornography

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Conspiracy

Threats of violence

Trade secrets

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Revenge porn

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.