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:

Revenge porn

Fraud

Why do so many people find Kakashi's character so appealing and inspirational?

No freedom is absolute.

Insider trading

Insurrection

Scientists find proof that birds nested in the Arctic alongside dinosaurs - Earth.com

And much, much more.

Trade secrets

Revealing classified information

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HIPAA violations

False advertising

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.

Anthropologists map Neanderthals' long and winding roads across Europe and Eurasia - Phys.org

Conspiracy

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.

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.

What is the difference between "eher" and " lieber" in German? Are the two synonyms? If yes, then which one is the most used?

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.

Child pornography

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Threats of violence

Perjury