A vegetarian chicken is an easy thing to have: Dont feed it any meat, totally control its environment and its movements.
I didnt say it wasn't stupid, just something one can accomplish if desired.
As for vegetarian chickens/eggs, Its no doubt a marketing ploy, working on people's ignorance. They hear or read the word "veggie" and they think "natural."
It's not so clever marketing, that's all... nothing to get upset over. Prolly sells a lot of eggs; which is it's intended purpose.
Personally, I think the whole vegan thing is a mixed up jumble, often contradictory, whether it applies to chickens, eggs or people.
I recall years ago it was proven that some animal protein in the diet is beneficial. I doesn't have to be meat, it can be eggs or dairy. Then you are a Lacto-Ovo Vegan.
But, it seems that many people who make the Vegan claim pretty much pick and choose what suits them. In many ways, it's more a badge or label, sort of a personal marketing plan, like "Look at me, I'm a Vegan..."
I know, I used to a rabid Vegan. No meat would touch my lips, no sir! Then, after some careful analysis, I concluded that my pious "Veganism" was mostly just fooling myself. Hardly worth the trouble, really.