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.

Freedom of speech does not apply to:

Terroristic threats

Are there legal obligations to report the known whereabouts of a missing person that doesn’t want to be found?

Revealing classified information

Insider trading

No freedom is absolute.

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Perjury

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.

Conspiracy

Why can’t the British eat or drink anything unless they place a table cloth on the table first?

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.

Trade secrets

HIPAA violations

Were the 1980s as uptight and prudish as movies and TV shows make them out to be? When I think of 80s culture, I think about a very "icky" judgmental yuppie status quo time period.

Threats of violence

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

Why is it that women are stronger than men nowadays?

Revenge porn

Child pornography

And much, much more.

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Insurrection

Fraud