Well, it could be for pure entertainment. Konoha might be interested in seeing how different authors combine the elements of Naruto and RWBY in their creative fanfictions.
Perhaps Konoha wants to explore new storylines that blend the two universes. In Naruto, there are unique ninja concepts, and RWBY has its own interesting world of huntsmen and magic. By reading the fanfiction, Konoha can experience a mash - up of these ideas. For example, imagining Naruto characters in RWBY's Beacon Academy or vice versa. It can also be a way to see different interpretations of the characters' personalities in new settings.
It might also be a way for Konoha to relax. Fanfictions often offer a different take on well - known characters and stories. Reading them can be a form of escapism. Konoha could be curious about how the Naruto and RWBY fandoms interact through fanfiction, and reading them gives a sense of being part of that crossover community.