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.

Threats of violence

Perjury

Archer Aviation Stock Tumbles: Here’s What This Investor Predicts Next - TipRanks

Insider trading

No freedom is absolute.

False advertising

Why does Taylor Swift endorse Harris when Harris supports open borders?

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

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.

What is the reason behind some people referring to themselves as "nice guys" instead of simply being nice?

Insurrection

Conspiracy

HIPAA violations

Brain’s Reward Center Tracks Not Just What, But When Rewards Arrive - Neuroscience News

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.

Terroristic threats

Fraud

Giant cable and satellite company closer to Chapter 11 bankruptcy - TheStreet

Trade secrets

Child pornography

And much, much more.

'Contaminated' cupboard staple recalled over 'life-threatening fungi' hidden inside - children are especially at risk - The US Sun

Revenge porn

Freedom of speech does not apply to: