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.

Terroristic threats

Fraud

Why are right-wing commentators spreading conspiracy theories about Haitians eating local pets in Springfield, Ohio?

Revealing classified information

Freedom of speech does not apply to:

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.

Consumer sentiment swings sharply higher in June as tariff anxiety recedes - Axios

Threats of violence

Insurrection

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.

Why do foolish atheists think their strange delusional theories are facts?

Trade secrets

Perjury

HIPAA violations

Are you offended if Democrats call Republicans "weird"?

Child pornography

False advertising

Insider trading

Do women wear undies under leggings?

Conspiracy

Revenge porn

No freedom is absolute.

Proposed NASA cuts to space science: “Staggering” - EarthSky

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.

And much, much more.