r/askhistorians is a fantastic example where curation produces high quality insight and debate.
If you’re not chasing infinite growth, or even if you are but want to set the right culture at the outset, I think the HN moderation model is ideal. Just delete low quality and blatantly offensive posts and ban repeat offenders. You don’t need some complicated mechanism for implementing restorative justice or scaling moderation via community moderation teams, you just don’t want those users to post
4chan is filled with people asking easily googleable questions and the user base generally seems to be about 17. I know that’s the age when I visited the site the most (thank god it was before the 2016 election which irrevocably ruined the site). It has a very low bar for discussion and the signal/noise ratio is terrible unless you’re willing to wade through piles of shit to find a gem here and there.
4chan for sure has useful insights like a very low (captcha) barrier to use the site and a very low-ego culture. But the discussion quality is actually abysmal
I think a central aggregator that is Reddit still produces the less friction. I haven’t felt compelled to sign up for any alternatives sofar. It’s an interesting field at the moment, and with Twitter in flux, a smart player might be able to take advantage of the unique opportunity.
Unfortunately I will need to switch to a non-pseudonymous account to launch and really talk about it, so can’t get into too much detail on this one.
I honestly think that, if these sites had been ok with measly 9 figure valuations and didn’t go chasing 11 figure valuations (or, a huge nonprofit treasure chest, or allowed petty busybodies to exert undue influence on the site), none of them would have gone to shit.
The bigger issue is that r/askhistorians is an English-language subreddit, and English is the most widely-used language of the Western-Imperialist powers, so it makes sense that if you ask in their language, you are mostly going to get their answers. The people who would have equivalent expertise from other viewpoints are mostly not lurking that subreddit.
And yes, it's not meant to be a place to debate, it's meant to be a place to get access to historians' subject matter expertise. When 2 historians' accounts conflict with each other, they aren't supposed to start arguing about it, they're supposed to each make a separate reply to OP with their sources.