The thing is all of the tools a team needs to create an H game successfully is already here, have been for years. Even if we discount steam, which we should given their arbitrary policy on H games, community funded platforms like patreon/substar/fanbox/boasty already pay the H game themselves, if not more than whatever dlsite or steam could pay you. H Games like Breeding Seasons and future fragments for example hitting the 5 digit mark monthly. Publicity for H games is easy as hell now, from garbage sites like the reddit subreddits for H games, discord nukige servers, to pirate sites like here and F95, you can easily get everyone to know your brand/cricle if you bother to reach out. Sometimes the H games that do managed to get finished are trash themselves even like Huniepop being a bejeweled H gallery, but it still sold inexplicably well, proving you don't even need to have a good concept for people to sell their paychecks.
It really is a case of work ethic from low quality human upbringing and how easily people are willing to dump hundreds on a concept regardless of who's at the helm, perhaps even intentionally getting carrot on the stick tricked. Steam could create some R18 only version and allow any and every type of hentai with all the free publicity and software, and people would still flood it with EA titles that would be abandoned and impossible to refund by then.