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.

Trade secrets

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.

Are there any guys, crossdressers, or transgender girls here who wear tampons?

Freedom of speech does not apply to:

Fraud

Child pornography

Why are Americans obese? Is it the food or is it the psychology?

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.

Insurrection

Perjury

Steelers quickly settle any Aaron Rodgers jersey number mystery after signing - New York Post

Revenge porn

Revealing classified information

Threats of violence

The Apple AirPods Pro and AirPods 4 Drop to the Lowest Prices of the Year for Father's Day - IGN

Insider trading

And much, much more.

No freedom is absolute.

CVS to shutter 5 pharmacies in New York amid closure of 271 stores nationwide - New York Post

Terroristic threats

Conspiracy

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.

How do you say "I don't speak Italian yet, but I hope to speak it well one day. It would be a pleasure to learn Italian with you. Would you like to teach me Italian?" in Italian?

HIPAA violations

False advertising