Commercial bone broth: is any of it real, or is it all made of LIES?

Yep, this is what I do-- use the leftovers from two Costco rotisserie chickens for stock. I freeze a carcass and save until I have a second one to make stock from.

Also, I started a thread on homemade chicken stock a few years back in which @Puzzlegal said she liked using a mix of roasted and raw chicken for the most well-rounded stock:

My absolute favorite, though, is a stock made about half and half from roasted leftovers and fresh raw wings, feet, and backs.

So ever since then, I keep a bag of raw frozen chicken wings on hand and throw a few thawed ones into the pot along with the rotisserie leftovers and it does indeed make for a fantastic stock / bone broth.