Some express online games can be rated "AO" (stands for Adult Only), pinpointing games that have written content well suited for only adults above the age of eighteen. Furthermore, online games need to also have an ESRB see that warns that any "online interactions aren't rated because of the ESRB". https://izmirusa.com/how-to-stay-safe-while-playing-online-games-tips-for-protecting-your-privacy/