The parent presented nothing other than hyperbole. What argument would convince them? Should I point to all the libraries that still stand? Even if the internet as a whole disappeared (not just their preferred platforms) we'd be in a better position re: access to speech and publishing than we have been for most of history. Hyperbolic claims like the parent's don't deserve an argument, they deserve to be laughed at.
Besides, this whole thread once again misunderstands "free speech" as some absolute natural law. But even at the founding of the country the authors of the 1st Amendment viewed it as a restraint on the federal government and no one else. Including state governments, much less private actors.
Banishing certain speech to less accessible realms is, in principle, the same as book burning.
"It's not about eliminating ideas from history," the censor explains, "it's about protecting the simple minds of the masses from ideas they can't be responsible with. The ideas are there in the dusty library for them to ponder in quiet consideration. They may even allowed to discuss in secret, hushed behind closed doors. Possibly even publish them if they can find a publisher willing to attach themselves to such vile print. But they just cannot be allowed to spread in public. The internet is too powerful a tool for spreading the lies and hate of the simple-minded, and the masses are too gullible. In order to protect democracy, we must protect the fragile minds of the voters, lest our enlightened and compassionate ideas are challenged."
Except everyone is still publishing. On the internet, even! And talking on television channels with an audience of millions. You can't point to a single individual who is unable to publish their ideas online merely because their ideas are unpopular.
The pre-internet equivalent of your argument is that if the New York Times refused to run something on the front page, it was being censored. Now that a company can access 2.8 billion people, you're suggesting that it must put whatever anyone wants front and center. But there is no credible argument that every claim is equally entitled to the most accessible and popular platform, which is why you made up a parable instead.
But: anyone is still free to challenge our enlightened and compassionate ideas, and those challenges can still spread in public, online. They are not relegated to dusty libraries. You can send a link to your friend from whatever website you want. You can buy servers and use them to express any idea you choose. You just don't get to use Zuckerberg's and Bezos's hardware to do it.
Besides, this whole thread once again misunderstands "free speech" as some absolute natural law. But even at the founding of the country the authors of the 1st Amendment viewed it as a restraint on the federal government and no one else. Including state governments, much less private actors.