While most popular games — including League of Legends, Fortnite, and Call of Duty — are OK to play, Twitch does ban video games that have the "Adults Only" ESRB rating. It also bans hate speech, sex, nudity, and extreme gore or violence from being displayed on screen. You can view Twitch's official list of prohibited games for guidance, though these certainly aren't the only games that violate the platform's guidelines.