Slaves also had it really good. Square meals, plenty of room to stretch their legs, lots of hard work to keep their minds and bodies active. They also received very good medical attention because obviously, their masters didn't want them falling over dead - they were useful, valued, and had better living conditions of many other humans.

Not sure which strawman you are referring to. If you believe that "most animals" would choose to swap their freedom in nature for the opportunity to live in captivity, I think we are getting into quite philosophical territory. The only example we can use is Humans, and we can both agree that Humans would choose freedom over captivity.