They self-select when they’re spread as viral games, but there’s nothing to stop a teacher from discovering it as a viral game and assigning it as curriculum.
There's also nothing to stop word of a particularly noteworthy game from spreading into the MemePlex as well. It can be countered with memes though, which is what much of our ecosystem is now composed of.
Shame, really, because it is very true and a great exercise for journalism students.