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

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.

And much, much more.

Revenge porn

What is your opinion on the band Nickelback? Why do they receive criticism from some people?

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.

False advertising

Perjury

Big Tech Is Back in S&P 500 Driver’s Seat as Profit Engines Hum - Bloomberg

HIPAA violations

Trade secrets

Insurrection

Cloudy skies can’t dim joy as thousands fill nation’s capital for World Pride parade - AP News

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.

No freedom is absolute.

Revealing classified information

Neuroscientists just discovered a fascinating fact about the grooves in your brain - PsyPost

Fraud

Threats of violence

Freedom of speech does not apply to:

U.S. Space Force awards BAE Systems $1.2 billion contract for missile-tracking satellites - SpaceNews

Insider trading

Child pornography

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.

This Quirky Accessory Can Actually Make Walking Easier And Boost Heart Health - HuffPost

Terroristic threats

Conspiracy