They do exist; but also constantly debate with stores like Steam about what can be allowed since Steam is ultimately much more visible. They make it murky with the occasional VN that’s “90% cryptic folk mystery, 5% romance, 5% visuals of non-consenting animated minors in the nude being victimized by a tentacle”.

Steam, for very understandable reasons, has waffled back and forth on whether to allow those games.