As a matter of techincal accuracy, The Ars Technica article reports that
monitored corporate networks had more traffic to/from megaupload.com than
to/from several other 'cyberlocker' operations, inncluding ones that were
more focused on the 'corporate' market.
'quite a source of bandwidth usage' is a bit of an overstatement, as the
traffic to/from Megaupload was somewhat over 20 terabyes, out of a total
of 10,900+ terabytes of monitored traffic. Or about 0.189% of corporate
usage on the monitored networks.