I used to work at KFC and it was someone's job every day to sort through the 'on the bone' chicken (stuff you get in buckets) to throw out broken bones, giblets, feathers etc.
Firstly, only this kind of chicken came from the UK. The rest is from mainland Europe before being marinated and shipped, which seemed unnecessarily inefficient.
Secondly, good god is the state of the chicken you get horrifying. I kid you not it set me towards becoming vegan. But compared to the chicken you get in a supermarket (say, an Asdas roast chicken) it is scrawny, frail, and so easily broken and poorly cleaned. The breading and frying process makes it look way more "full".
Between farmers and businesses these birds are a source of untold horror AND a vector of our next potential pandemic, whether it be H5N1 or something else. Not even before we consider the totally unsustainable nature of farming poultry both ecologically and economically.