Something I've always been wondering (account bans)

[BlueAlchemy]

A long time ago, people who got perma banned used to simply have there accounts deleted, (this was both on private servers and iRO) but now there just perma banned, whats up with that? Although I can see a few reasons why perma ban would be a logical thing to do such as being able to appeal a unjust ban, but I want to get an opinion or explanation from someone else.

EDIT: and before anyone asks, this was just on my mind for the past few years