Fully agree that definitions have to be clear because a sentient being could be a plant, an animal, a rock, whatever... just depends on one's perspective.
So if I drink milk bought from a farmer and said farmer, without the consent of the cow, has ''enslaved' the cow to produce milk, am I a "cunt" for supporting the farmer by buying the milk? Am I now part of the machinery that supports this type of enslavement?
What about vegetables? What if I grow vegetables with the express intent of eating them when they are ready to be harvested? Is that a kind of enslavement as well? How do we know that vegetables don't object to being harvested? Maybe they had other plans besides becoming my dinner...
In the limit, if I'm a math/computer nerd and I think of a new fractal program and make the program do trillions of calculations or a bitcoin miner and use my array of computers to mine ad infinitum, does that constitute computer/program enslavement?
I only bring this up because I don't have any answers or even half-baked ideas on where to go with this line of questioning... Maybe we all do the best we can with what we rationalize to ourselves until we dig deeper and end up with more questions than answers... or the 'lucky' ones end up with resolution and move on.