Heh. I checked the account name "sakura" and apparently it was made only 5 months ago. It hasn't been very active either, which is a shame, as I would really liked to have had that account name. :| I wish they would start making account names available in which the person just created the account, then never logged back on. Who cares if one day they suddenly decide to log on again? The chances of them coming back is low, and if they haven't logged on for 3 or 6 years, they most likely won't remember their password, or even the username they signed up with, anyway.
The username i want the most would be "emeralds" that was a mad name and a pretty cool guy that owned it aswell.
Ehh well I just checked my account from years back. It's still in their database..I highly doubt TNT will delete them in case they need it for future reference or something. Personally though, I suspect they've deleted all the user's items/neopoints/account information, leaving only the basics (e.g. the pets). I also actually don't believe I was frozen for a legit reason..but oh well.
I signed up for an account yesterday. It has a good name. I was surprised to get it. Set up as normal , empty account etc., except it was already guild leader for a guild that is 5 years old !!