“Chickens are placed in coops that are too crowded and the chickens start to peck each other (Many people only eat Free range chickens for this reason)”
It is generally chickens that lay eggs that are kept in cages (and a lot of this has to do with protecting them from catching bird flu, which would require destruction of all the animals), ones that are raised for meat are typically kept corrals or barn like structures. Free range just means they let the roam outside the corral. They are not kept continually in crates.
However all are transferred to crates to be brought for processing, which includes shechita in case of kosher. Even free range. Either way, all this would be permitted, and would not be tzar baalei chayim.
If you want to make a point, please start with facts.