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

Freedom of speech does not apply to:

Scientists create a two-dimensional carbon material eight times stronger than graphene - Earth.com

Terroristic threats

HIPAA violations

Child pornography

Mysterious fast radio bursts help astronomers pinpoint cosmic ‘missing’ matter - CNN

Revealing classified information

Revenge porn

False advertising

Robinhood Traders Playing S&P Index-Guessing Game Get Schooled - Bloomberg

No freedom is absolute.

Insider trading

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.

Belmont Stakes: Hill Road faces challenges beyond tough field - Horse Racing Nation

And much, much more.

Conspiracy

Perjury

Why do guys on dating apps often just first message "hey" or "hey how are you" instead of being more creative and unique? How do they think being a copycat will stand out?

Threats of violence

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.

Insurrection

What was your embarrassing moment in front of your father-in-law as an Indian daughter-in-law?

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.

Fraud