supplemental lighting isn’t giving the birds hormones. Supplemental lighting isn’t terrible. The birds used in large scale egg production are meant to lay a lot for 2 years, then less so. As a business they get rid of the birds, who are likely turned into food or feed. It is a good thing to have production Facilities on a large scale to be able to provide eggs at a low cost. Eggs are a good source of many nutrients and many people cannot raise their own birds to get eggs and/or could not pay high prices for a dozen eggs.
yes. Why is this a negative?
chickens are livestock. Not classified as pets. however, even those that have chickens as livestock, also likely have a favorite one or two in the flock.
generally, when an animal is on your land, you get to choose what to do with it. Pamper as a pet, raise as livestock, 4-H project, etc. there is little risk of having to protect your animals from marauding bands of chicken butchers.