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Previously posted info may now be detrimental because you're on the outs with someone who knows that Cellar username.
Casual cross-referencing of usernames may enable investigators to research all of them in background checks, especially federal agencies that require access to your personal computer (FBI did this with my niece) before granting a security clearance necessary for employment.
Stalking can be thwarted (that's what UT did for me).
And believe it or not, sometimes people just want a fresh start after youthful indiscretions especially if previously posting as a minor and later making the request as an adult.
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