Edit: Steam should assume more curation roles.

Never going to happen. It's valve lmao.

Also porn games will keep getting delisted and removed because ultimately it's the payment processors powering the store that have the final say. And nobody there is interested in indulging in your content checks, they have their own.

Do a thorough quality and content check (i.e. no rape, kiddy diddling, spousal abuse, any other type of abuse, etc.) on ALL of them, and throw the slop away. Then do this for every other genre

There are games that talk about or depict abuse as part of their story line. I think adults can be trusted to engage with art that has adult themes. In the end the hardest part (of letting adults in but not kids) is enforcement, games are rated for that reason but it's on parents to care.