The Stack Exchange model is to:
Stack Exchange is a network of 142 communities that are created and run by experts and enthusiasts like you who are passionate about a specific topic. We build libraries of high-quality questions and answers, focused on each community's area of expertise.
In that vein, our sister site, History.SE, has the following as a close reason:
Requests for trivia or basic historical facts are off-topic if they can be easily answered by looking up the relevant topic on Wikipedia. We're trying to complement common historical references, not duplicate them.
This allows them to close waste of time questions that are none of "unclear what you're asking", "too broad", or "primarily opinion based". Could we please have a similar custom close reason, e.g.:
Requests for trivia or basic mythological facts are off-topic if they can be easily answered by looking up the relevant topic on Wikipedia. We're trying to complement common mythological references, not duplicate them.
Let's do everything we can to keep the quality of contributions to this site here, and give ourselves a straightforward, standard way to close these sorts of questions.