This is already a phenomenon seen all over social media. Look at Twitter, for example, where the only metrics of success are likes and retweets. Even there, content is dominated by garbage "parody" accounts, who all repost the same stuff. Why are these accounts the most popular? Well, on a platform like Twitter, people are rewarded via followers and notifications for playing a part of the majority. It's the same reason why you only see conservative view points ridiculed and progressive ones hailed. The best content strays too far from the norm to make up the most exposed content.

You can see this everywhere. Hell, look at top movie lists. The Shawshank Redemption routinely lands #1 on user generated lists that consist of voting for what you like. So does Pulp Fiction. Are these the best two movies ever? No, they aren't. So why do they always land on top? Because they are the goodest. Everyone likes these movies. It may not be everyone's favorite, but everyone likes it.