Art style is my conjecture. In case of SS3, it contained actual footage of women (not fictitious / drawings), which they scrutinize more closely. Doesn't excuse the SS3 ban but those are the differences.

Could also be attributable to the human factor in different reviewers, which would allow for trends but not prevent anomalies. We've seen ideological games get green lit or stand for far longer on the store than they should, see LGBTQIAWTFBBQ+ explicit titles and BLM troll game as examples.

Subverse also had the benefit of being highly preordered, which could be yet another factor.