That's pretty impressive stuff actually. MMO's generate scads of data. It sounds like the behind the scenes software that keeps track of all the data for every player including what's in their inventories, ingame bank accounts, levels, transactions, where they were when last logged etc. All of that info is massive data and must be monitored, sorted, stored, cataloged, backed up and, readily recalled when you log in to play so you can go and do just that.
If true, they're not kidding around with whatever they're up to.