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

No freedom is absolute.

Child pornography

Perjury

Is Gupta Nilayam season 1 of Raghul Vasudevan completed? Can he compile and send all Episodes at once as a long story?

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.

False advertising

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.

Why aren't F1 cars popular on the street?

HIPAA violations

Fraud

Trade secrets

Do Americans realize how much goodwill and credibility they've lost in the past two weeks?

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.

Insider trading

And much, much more.

Common blood pressure drug slows aging and boosts lifespan, even in older animals - Earth.com

Terroristic threats

Freedom of speech does not apply to:

Revenge porn

Have you had any paranormal activity situations happen personally to you or someone you know?

Insurrection

Revealing classified information

Threats of violence

Why is my ex trying to provoke an argument with me?

Conspiracy

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.