I have seen some sleep streamers getting banned from streaming even without showing anything. I have worked on categorizing twitch chats before and labeling them as either sexual, doxing, violence, racist, etc. I have a feeling their ban is caused by the sexual comments they get and therefore their streams are detected by the chat/comments evaluators and therefore categorised by YouTube as sexual and violating their policy. This is all speculation but if you want your live streamers to be able to stream more, I suggest avoiding anything too sexual when commenting or chatting.