In my country there was a group of wild chickens, that established themselves. Also a place where people dumped chickens and people (with children) gave feed (like old bread).
They survived as a group and the numbers increased.
It got problematic because the roosters were too loud for the people who lived there. A home with elderly and patients had problems with people waking up jn the middle of the night.
I don’t know how many got killed by predators during the years they lived there. But finally the local authorities started to catch all chickens and gave them a new home/got them euthanised within a few months time.
Again it was the supreme predator who won.
I have chickens who free range several hours during the day. I want them to come back to the coop and lock them in. They are not wildlife and I am responsible for them. Its a no go if they go elsewhere to bother people.
And I want some eggs too.

Real free rangers often seek places where you cant find the eggs anymore. And thing can get out of control.
Btw, the predator load here in Europe is not as bad as in many places in the US. But I had several chickens who got killed or vanished. I never intended to kill the predators because I believe a natural balance is the best to rely on. Having a safe coop for the night and a safe run for the early hours is very important where I live.
Oh, and btw my chickens are bantams. The small ones are real good flyers.
If they start to roost on top of the run or in trees, I make sure that they are locked inside before sunset.
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