the Empires agri worlds also exported to the rest of the cluster, heavily enough that there were reports of shortages or even famines when the empyrean age war started and this trade was reduced.
Ealur, home of possibly the most sidelined and oppressed race in EVE, has a Gallente commercial station in it. "Genuine Handmade Sports Shoes!!!"

All the powers are part of the CONCORD treaties, which are supposed to keep humanity from wasting each other (again).
Selling anything in an Amarr station, or renting an office, or using any facilities, gives ISK to that Amarr corporation.
Purchasing datacores from Amarr agents, or blueprints for things too. Missions for Amarr corporations.
There's a whole lot of things that are indirectly benefitting from slavery.
Selling slaves, or purchasing them, however, directly supports slave trading and slavery.
That might be the only line that can be drawn.