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

No freedom is absolute.

Conspiracy

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.

BTS’ Jungkook and Jimin Discharged from Korean Military After RM and V - Rolling Stone

Fraud

Trade secrets

Revealing classified information

AI agents get office tasks wrong around 70% of the time, and a lot of them aren't AI at all - theregister.com

Threats of violence

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.

Does Rosemary aroma really improve memory? Here’s what research says - Times of India

Revenge porn

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.

Child pornography

Tea, berries, dark chocolate and apples could lead to a longer life span, flavonoid study finds - Medical Xpress

HIPAA violations

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.

Freedom of speech does not apply to:

After 600 Years, Astronomers Finally Solve the Mystery of the Missing ‘Guest Star’ - Gizmodo

False advertising

Perjury

And much, much more.

'Rock Showman' uncovers sandstone stegosaur near Whitby - BBC

Insurrection

Terroristic threats