Which is what i would expect, there is no need to clean up the names, they haven’t had to do it to anything other than trial accounts in the last 15 years, why would you expect them to now delete names that they plan on using again?
Does microsoft purge unused hotmail email addresses? does yahoo? does google? does blizzard delete character names of players who have stopped playing and never intend to play again?
i don’t see any kind of valid reason as to “why” you want these names cleared up other than i suspect you seem to want to reuse one of the names, i don’t exactly see how these names existing causes any actual real issues so i’m not seeing a “need” for them to be cleaned up