Without automation and human moderators to clean up, it's basically impossible to have a free exchange of ideas or any good discussion. Free speech disappears into the noise.
The idea of free speech is great and was a big step forward in an era where government oppression was a primary fear. But in the Internet Age, I think Civil Discourse is a better goal to aim for.
Automation makes mistakes. A LOT. Sometimes a person catches them and overrides the bot, often they don't.
There are some communities that abuse the automation to enforce bias, of course. For example, /r/news appears to be auto-censoring things about coronavirus or that might be perceived as negative for Trump (ex: the Russian bounties scandal). But this is much rarer than people think -- with the exception of bans, most of the "mod abuse" is simply bots screwing up.
Any commenting system is going to need some way to value signal from noise, and popularity by itself isnt enough.
What I did say, was that moderation, as it stands now, has blowback, which includes but is not limited to creating and reinforcing refined groupthinks.
The junk mail folder in your email mailbox is an example. It offers transparency.
Sure, but in practice this is what true free speech on reddit for a large sub looks like before moderation
* 3 knee jerk replies
* 10 pieces of spam asking you to buy their bit/altcoin or click on their affiliate links
* 5 people who are hurling vile insults at you for whatever reason
* 8 more people who are hurling vile insults at each other, and just happen to be in your comment chain for some reason
* 1 reasonable, well thought out response
* 2 people who are lost and looking for a different sub
* 1 person replying half a year later after everyone's gone
Something in that ratio
With no moderation at all, you're lost in a sea of spam, scams, and insults. And because of the extremely poor SNR, your reasonable replies dry up and just leave.
I agree not everyone has to go the r/askhistorians route of completely iron fist, but you can't actually run a communication forum with millions or tens of millions of subscribers without a lot of automated and manual moderation. True free speech ends up being no speech because everyone got scammed or insulted and just decides to leave to go somewhere smaller. (edit: trying to untangle my confusing sentence)
It might work for smaller communities. It does not scale.