They are saying in P4 they can wipe the characters if they deem it necessarily. Like if someone found some exploits that let you dupe items, gil, power level super fast anything that could be considered game braking.

Ever hear of the guy in Everquest 2 who made over $35k exploiting a bug he found that let him dupe gold didn't share it or make a bug report sold tons of gold to gold seller sites and various people.

So stuff can happen that would require them to wipe everything.