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:

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.

Insurrection

Why am I always so tired and I don't eat enough?

Threats of violence

Perjury

Revenge porn

Why do Muslims not get HIV/AIDS in spite of having 4 wives and multiple relationships?

Child pornography

Conspiracy

False advertising

We Still Don’t Know How Tickling Works But a New ‘Tickle Lab’ at a University is Finding Out - Good News Network

Insider trading

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.

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.

NASA unexpectedly finds 'X-shaped structures' in Earth’s upper atmosphere, which they can’t fully explain - Earth.com

And much, much more.

Terroristic threats

HIPAA violations

Trans athlete embraced as California track and field champion by peers while adult activists duel - San Francisco Chronicle

No freedom is absolute.

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.

Fraud

Hallucinogens Linked to Milder PTSD - Neuroscience News

Revealing classified information

Trade secrets