I'm so sick of people acting like Valve is some saint that does no wrong. Their market dominance means game developers wanting to reach the PC gamer market must comply with Valve's terms. Why do you think every Japanese visual novel released on the platform is a cut down, all-ages version that requires an off-site patch to restore the full game (and often even then it's censored in weird ways)? They got sick of being delisted while Valve turns a blind eye to all the trash porn games.
Ask yourself, does a marketplace that exerts creative control over specific studios' works while threatening financial repercussions if they don't comply benefit everyone? That sounds more like the mob to me.
Stop deifying companies.