This is not a good comparison. Youtube without censorship wouldn't look any different to you, unless you are interested in the kind of stuff that now gets censored. Remember that youtube had barely any censorship for a long time. Did your recommendations look like 4chan then? The reason 4chan looks the way it does is the bumping algorithm, which promotes controversial posts, not just the lack of censorship. A platform where the frontpage is based on a recommendation algorithm wouldn't look like that, and in fact didn't look like that before it started censoring at this scale.