[suzumer]

I wouldn't describe 4chan as karmaless. While the site bemoans the idea of upvotes (updoots), they'll also be the first to tell you how much they crave replies (which they call "you"s). We can see how much this affects the forum, with many people posting content, not because they think it is the best thing to post, but because they think it will get a reaction.

[t12hrow]

Yes, I've thought about that. In my opinion, the difference is that "you(s)" often reward controversial/contrarian takes. 4chan is already contrarian so what I mean here is going the opposite way. That is, you can go and post something that's completely against the culture of the forum and you'll get plenty of reactions. Even if it's just insults or slurs.

In a funny way, this incentivises swiming against the current, so there's never a consensus.

Karma on the other hand only creates a chilling effect, beacuse you're either banned or shadowbanned or somehow silenced. Take HN for example, if you post something controversial here not only it doesn't get more visibility, but it's grey-ed out and thrown to the bottom.