More name changes, more data it has to hold. With millions of users, the added data would add up. It might not be a server issue, but it would make sense.
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^^^^^^^
All 3 of these
A troll can easily come to a clan, kick out a bunch of people, get banned from joining that clan, change their name, and repeat. Also, you had to confirm 3 times to change it, so if you made a mistake.....................