Why doesn't Riot ban names with misspelled profanity?

There is a player named F**MeDaddy with the F word misspelled but obvious using Q. The player has been on for months at least and hasn't been forced to change it. Considering they ban for using profanity in chat, how has this character not been banned/made to change yet? Just curious if there was some loophole.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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