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

Freedom of speech does not apply to:

No freedom is absolute.

Trade secrets

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Revealing classified information

Insider trading

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.

What does it mean when you dream that your mother died?

Conspiracy

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.

HIPAA violations

Is it common for Americans to feel "trapped" due to the size and distance of their country from other countries/continents? Is this feeling an exaggeration or a reality?

False advertising

Revenge porn

Perjury

Can you tell me something about yourself?

Fraud

Threats of violence

Terroristic threats

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Insurrection

Child pornography

And much, much more.

How does gut health affect mental well-being?

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.

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.