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 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.

Fraud

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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 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.

No freedom is absolute.

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HIPAA violations

False advertising

Threats of violence

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Revealing classified information

Trade secrets

Terroristic threats

How is TikTok able to censor porn?

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.

Perjury

Insurrection

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Revenge porn

And much, much more.

Conspiracy

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Child pornography

Insider trading