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:

And much, much more.

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.

Has anyone ever had sex with their cousin? How did it start, and would you do it again?

Perjury

HIPAA violations

Fraud

All international travelers should get measles vaccinations, CDC says - AP News

Revealing classified information

Insider trading

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.

What is your first experience having sex with older men?

Terroristic threats

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.

False advertising

Germany’s Merz ventures into Trump’s lion’s den - politico.eu

Child pornography

Conspiracy

Trade secrets

How are Hinduism and Sikhism related, considering they both originated in Punjab, India?

Revenge porn

Threats of violence

No freedom is absolute.

ISS Research & Development Conference Cancellation - NASA Watch

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.

Insurrection