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

And much, much more.

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.

Most people obey arbitrary rules even when it's not in their interest to do so, experiments show - Phys.org

Freedom of speech does not apply to:

Terroristic threats

No freedom is absolute.

Texas Tech's NiJaree Canady breaks down after heavy pitching load in Women's College World Series - AP News

False advertising

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.

Insider trading

Should women be allowed in “combat roles” within the military?

Trade secrets

Revealing classified information

Conspiracy

If You Deal With Pain From Sciatica, An Expert Says These Products May Help - HuffPost

Insurrection

Revenge porn

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.

Why is it common for guys to sleep with 10-20 women then marry a good girl?

Fraud

Perjury

Child pornography

Game-Changing Fossil Discovery Reveals That Reptiles Appeared on Earth Millions of Years Earlier Than Thought - SciTechDaily

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.

Threats of violence