I haven’t really dived deep on this but my gut feeling is because they linked to the erotic games. I looked into this a bit in the past, but I may be getting it mixed up with Google’s policies on Docs now that I’m thinking of it, but maybe they have similar policies. The gist was that they weren’t as concerned with hosting legal artistic erotic content as they were linking to it. Like they didn’t want their platform to be used in a way to sort of advertise porn. I’m actually pretty sure I’m thinking of Google Docs though. I was looking for a way to publish erotic stories and considered GitHub Pages as well as Google Docs so it sort of blends together.