Yes, but as you can see they kill their prey too quickly to have entertainment value.

It's niche/illegal nowadays, but we're talking about a very old tradition in SEA that was spread to Europe by the Romans.

https://www.todayifoundout.com/index.php/2013/08/chickens-were-initially-domesticated-for-cockfighting-not-food/

No, that's an urban myth

Edit to clarify: protein toxicity is a real condition, but unless you're a starving in the middle of nowhere with nothing to eat but meat for months, it's not a concern at all. You can get it from eating only beef just as well.

I have very little experience with them since the industry is pretty much only getting started over here, but you can debone them thoroughly. Like you can even get all of the meat in one piece without any bones.

Rabbits fell out of popularity. It became an expensive meat.

We're talking about historical context, not contemporary comparisons.

The drawback on rabbit is the very lean meat (see rabbit hunger).

You can get protein toxicity from any meat, and it's not a concern unless you're starving in the middle of winter and have literally no food besides meat.

Also, ancient people didn't have factory farmed broilers, and millennia of selective breeding for meat, those chickens were lean as well.

The males are exceptionally aggressive as well...

Because cocks are gentle and don't regularly attack humans? And that's after a lot of selective breeding to make them more docile, and not for fighting.

Duck eggs are not for everyone. And the creatures require more water. The fatty meat is not very agreable for everyone.

Edit: Apparently they were domesticated a lot later.

Yeah guinea fowl were a stretch for many reasons.