Video platform Bilibili superimposes user commentary on videos as they play ("danmu"). This seems like it'd be a total disaster, but the comments are usually high quality—in part because you have to pass a 100-question test on danmu etiquette and cultural trivia to post!
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More in this great article: medium.com/magpie-digest/
e.g. to post colored comments or position them, you need to have made more community contributions (like karma on a message forum).
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My guess is that limited scale must be important for these comments too? If the site had 500M users, it would be hard to imagine the test being effective (apparenly there's a black market for answers!). Enough people could fake their way through to create an awful experience.
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Scale matters a lot. As a Bilibili user from 2011 I assure you that danmu quality has deteriorated. It used to be a rather exclusive community for people into ACG culture, but they make the test a lot easier and more generic nowadays. User demographics is probably younger too.