I think it would have to depend on the bird. Raise your hand if you have a dog or a cat? Now go check the label on their Dog chow or Fancy Feast. Chicken is probably near the top. Chicken that was subpar for the table. Or turned into Chicken Nuggets or somesuch. And, there is nothing wrong with that, there is little/no waste. So, whether it goes to someone that wants to eat it for Sunday Dinner, or feed FiFi the Snake, the only difference is in our heads.
Now, I have one FCBM that is looking an awful lot like a Cockerel and I will sell him at an auction...I think he has enough market value to someone wanting to breed FCBM's, or Olive Eggers, that I'm not concerned about it. And, if after paying for it, they eat him, so be it. I can only control what I can control. Obsessing about how someone keeps their birds is a fools errand. I've seen enough outside of the chicken world that bad things happen despite due diligence being done.