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.

Revenge porn

Fraud

Can you share something that captivates you, whether it's an idea, a discovery, or an invention?

HIPAA violations

Insider trading

Freedom of speech does not apply to:

SpaceX launch from California sends 26 Starlink satellites into low Earth orbit - Space

Child pornography

False advertising

Conspiracy

MindsEye Is Officially The Worst Reviewed Game Of The Year So Far - TheGamer

Perjury

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.

And much, much more.

Scientists stunned as heat caught on camera ‘bouncing like sound’ for first time ever - Daily Express US

Trade secrets

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.

Revealing classified information

Coco Gauff Beats Madison Keys, Updated French Open Women's Bracket at Roland-Garros - Bleacher Report

Terroristic threats

Insurrection

No freedom is absolute.

GoFundMe for teen who rushed to Burger King shift after graduation skyrockets to $130K — and keeps climbing - AOL.com

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.

Threats of violence