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They're Usually Shredded Alive Rule :(
(i.imgur.com)
They're usually shredded alive almost immediately because they're seen as "waste" since they don't lay eggs
For some more context:
I had this same question, I learned "meat" chickens are called broiler chickens, they were bred to put on weight rapidly. Egg laying chickens are separate breed and grow slower or won't grow to the size of a broiler. The industry is limited by containment footage, so they wouldn't use a male egg laying chick where they could house a broiler.
This is really unfortunate. I see the size of chicken breasts these days, and it's silly. Our society is very wasteful.
Wasteful of what, though?
If a particular farm can produce 1000 kg of meat and 500kg of bones/other waste in a year by raising female meat chickens, would it be a waste to devote that farm to raising 500 kg of meat and 400 kg of bones from male egg chickens? In a sense, that's a waste of the farm to produce half as much meat as it can produce through killing chicks.
It's a philosophical difference on what weight to assign to the lives of chicks, adult chickens, other resources including human labor, etc. The lazy shortcut is to maximize return on dollar investment with no regard for any of those moral, ethical, and philosophical considerations, and that's what most of the industry does today, but even if you shift to a new moral framework you'll need to decide how to weight those things.