This actually does virtually nothing to ban porn games, as they typically aren't rated. You don't need an ESRB rating to release a game on Steam or independently. Additionally, sexual content is already banned so theres that. Unless they are releasing on Consoles, Visual Novels are practically never given an actual ESRB rating.
This decision was really just made for Hatred, as there are only two other games that this bans and neither are relevant (Manhunt 2 and Fahrenheit - Directors Cut AO version). From what I've seen, Hatred didn't even deserve the AO rating in the first place, and Twitch still allows streaming of other games such as Postal 1, which feature similar goals (killing innocents). This was solely a PR move
PS: It is Sakura Spirit that is banned, not Senran Kagura.
