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

No freedom is absolute.

Conspiracy

Freedom of speech does not apply to:

Is it really a good idea for Taylor Swift to publicly endorse Kamala Harris? Most probably inferred it anyway. But, by making a statement, it will likely alienate Republican fans. It seems wiser for entertainers to be politically neutral.

Trade secrets

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.

Child pornography

Why is the trade war between the United States and the rest of the world keeping on escalating, with US goods facing brutal boycotts from the global economy? Isn’t this horrific for US companies whose earnings and stocks are already collapsing?

False advertising

Insider trading

And much, much more.

Clint Eastwood Shades Era of Remakes: Do Something New or Stay at Home - Variety

Perjury

Revealing classified information

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.

The World Ends with You Director Tatsuya Kando Leaves Square Enix - Anime News Network

Revenge porn

Insurrection

Fraud

Surprised scientists discover the 'dark sides' of Uranus' moons are the wrong way around - Live Science

HIPAA violations

Threats of violence

Terroristic threats

What do men like to be given for their birthday?

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.

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.