I think It would be neat to have a option, where you can craft or hire something like a slave for mining for people, who just don't like slavery.
Maybe a robot, which can be built, but cost a lot of resources.
Should be equal-effort or more than slavery. rather more. Shouldn't be too easy and slavery should be still an option.
Why should I capture people, when I can easily craft a robot, which do the same?
But why should I build a robot, which needs more effort than slavery?
Just an idea. I just don't like slavery.
(I wouldn't profit from this idea anyway with the loner trait)