If everyone hates censorship so much, why do those “censorship-free” alternative social media sites always fail?

That has nothing to do with social media.

I hate censorship. That is, I think the government has no place controlling what people say, read, express, or create, except insofar as is necessary to prevent things like terroristic threats, dissemination of classified information, fraud, false advertising, and so on.

Now, say you’re an ordinary person. You don’t like child porn. You’re not a Nazi. You don’t want to shoot up a school or blow up the White House.

Scientists discover universal rule that governs all life on Earth - The Brighter Side of News

“Censorship-free” social media sites quickly become Nazi bars where people exchange child porn. Normal human beings don’t hang out in Nazi bars with pedophiles.

If i let you use my computer network for free, I have the right to tell you you can’t do certain things with it, and I have the right to kick you off. Why? Because it’s my property, not yours.

Because you’re confusing two different things.

Sean Combs Complains to Court Sketch Artist - Newser

The #3 user? Terrorists. 8kun was used to plan 3 different school shootings in a 6-month period.

Nazis.

Are you going to stay on a social media site that’s all photos of babies being raped, Nazis posting graphic descriptions of finishing what Hitler started, and plans for school shootings?

What are the tools HR recruiters or talent acquisition managers generally use to ease the process?

So.

Who is the #1 user of completely free digital communications networks that let you say absolutely anything? Who most wants that?

We don’t have to guess. We know.

Walkoff caps ‘unreal 24 hours’ for Mariners’ Cole Young - Seattle Sports

Who is the #2 user of completely free digital communications networks that let you say absolutely anything? Who else wants that?

If I let you borrow my bike for free, I have the right to tell you you can’t do certain things with it, and I have the right to take it back. Why? Because it’s my property, not yours.

Why do “censorship-free” social media networks always fail? Well, let’s see. Sit down and think. Think really, really hard.

Turning the Red Planet green? It's time to take terraforming Mars seriously, scientists say - Space

Child pornographers.

The #1 problem people who make and consume child pornography have is connecting the producers with the buyers. Any “censorship-free” network quickly gets overrun with child porn. Classic example: 8kun.

You have the right to say what you want. You do not have the right to use other people’s stuff for free.

The administration’s anti-consensus Mars plan will fail - SpaceNews