I don't believe that the GSU exists. I think we're all just victims of a huge mistranslation. When they say "GSU," I believe that they're actually trying to use an acronym for their anti-cheating policy: "Guys, Shut Up." The policy is very simple:

1. Do nothing. Stopping cheating is too much work, so don't bother even trying.
2. People will whine about the cheating, so just tell them to shut up.
3. Run bots in spare time and sell the gil online.
4. Profit.

Given how lazy and uncaring SE has been about handling bots, I'd be extremely surprised if they weren't getting kickbacks from the gil sellers. The people in charge of ARR certainly seem complacent and corrupt enough.