I read about its avoiding on https://chekkee.com/6-common-tricks-use ... y-filters/ such service use in social media or youtube. Chatting in-game, or in the lobby before a game, is an integral part of the multiplayer experience. But when you gather hundreds of thousands of people in the same place, you can expect a few people to use unpleasant words or harass other players.
Profanity filters can be applied to all forms of text-based UGC, including usernames. While most usernames will not contain profanity or hate speech, some individuals will use the account creation process as an opportunity to include words that are offensive or inappropriate