From what I remember, only the STF deals with this, and I recall the credits showing the STF has about four people to the team.
Imagine four people and lists and lists of account names being made faster than you can count.

Really what we need is an anti-RMT team. The STF deals with other issues beyond this already.
Problem is, Japanese servers have next to no RMT, so developers and others in charge may never see how big the problem really is. Even with the report numbers.