As a researcher, the main worthwhile thing that I am doing is publishing research, but having all this prior scholarship at hand 24/7 definitely makes it easier to produce said publications. And if I have created a scan, why not help out my colleagues, too?

"Deal with the ethics", seriously? You might want to learn about how heavily shadow libraries are used across academia now. It’s no longer just disadvantaged scholars in the developing world relying on pirated scans because they don’t have good libraries. It’s increasingly everyone everywhere, because today’s shadow libraries can be faster and more convenient than even one’s own institution’s holdings. At conferences, if the presenter mentions a particularly interesting publication, you can sometimes watch several people in the room immediately open LibGen or Anna’s Archive on their laptop to download it right there and then.