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.

Revealing classified information

Insurrection

Amazon Draws Whole Foods Closer in Grocery Unit Reorganization - Bloomberg

Conspiracy

Fraud

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.

Procter & Gamble says it will cut 7,000 jobs over the next 2 years - CBS News

Perjury

Freedom of speech does not apply to:

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.

How can I easily get rid of my writers block?

No freedom is absolute.

HIPAA violations

Trade secrets

Doctors issue worrying warning about irreversible ‘side effect’ of Ozempic, Mounjaro and Wegovy - LADbible

Revenge porn

Terroristic threats

Threats of violence

20-Year Mystery of The Muon's Wiggle May Finally Be Solved - ScienceAlert

Child pornography

And much, much more.

Insider trading

Century-Long Study Reveals Startling Differences in Life Expectancy Across U.S. States - SciTechDaily

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.

False advertising