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

Threats of violence

And much, much more.

Child pornography

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Terroristic threats

Trade secrets

HIPAA violations

Why do older siblings always hate younger siblings?

Insider trading

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.

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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Revenge porn

No freedom is absolute.

Perjury

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Fraud

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.

Conspiracy

Why does my crush always looks at me in a sad way whenever I talk with other boys, and if he catch me staring on him then he go and flirt with other girls and then check if I am looking at him?

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.

Insurrection

Freedom of speech does not apply to:

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Revealing classified information

False advertising