No, it absolutely does not. Lemmy has a LOT of groupthink, just a different type of groupthink than the norm.
Reddit pre 2014 was the wild fucking west. You’d have some girl posting about why she likes sticking goat intestines up her butt and the comments would be all “it’s not my thing but I can see your point of view”. People were selling heroin on a public forum. There was a sub called something like “fiftyfifty” where you click on a link and it’s either a cute bunny or some dude getting beheaded, no blurring or censorship just full gruesome decapitation. The most popular sub was called “jailbait” for chrissake.
Like, kids today cannot comprehend how sanitised everything is. You are locked in a box. Lemmy is a different box than reddit is a different box than Instagram is a different box than Facebook is a different box than Twitter. You don’t know what freedom is. You will never know. It’s exhilarating and terrifying. But all you can do nowadays is pick a different box.