Recently, Steam conducted a large-scale sweep of adult games that "violated the rules of banks and payment systems." Now there is information that moderation now only allows finished "18+" games.
Indie developer Dammitbird published a screenshot of the response from Steam support, which was studying his game Heavy Hearts — he wanted to launch it in early access:
«Rejection: Your application has failed review as we are unable to support an Early Access model for the development of games with \"mature themes\". Please resubmit when your application is ready for release without Early Access».