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

Freedom of speech does not apply to:

False advertising

Threats of violence

Why are some people afraid of monsters?

No freedom is absolute.

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.

Revealing classified information

Can someone write me a sex story?

HIPAA violations

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.

Fraud

Deadly fungus that can 'eat you from the inside out' is now in the U.S. and quickly spreading around the world - Earth.com

And much, much more.

Revenge porn

Insurrection

How do you know when your skirt is too short?

Conspiracy

Trade secrets

Child pornography

How should one handle a situation where they suspect their partner of cheating, but their partner denies it and claims it is all in their head?

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.

Perjury

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.

Why don't younger men like older women?

Terroristic threats

Insider trading