[Maybe] A few more users than average submit articles on a topic. Other people see them and find them interesting. Nobody is fatigued enough to flag the topic.

[Maybe] A few more users than average submit articles on a topic. Other people see them and find them interesting. Nobody is fatigued enough to flag the topic. The front page doesn't happen in a vacuum. Other sites, conferences, youtube etc. all contribute to discovery, background knowledge, and saturation.