My chickens love corn (as a treat). They get Kalmbach 20% grower feed with OS on side. 1st ingredient: corn.
As a customer of a feed manufacturer, I expect to buy a feed they will do well on. This feed seems very good for them. As a customer, I would expect the feed company to have done their R&D to produce a good, animal appropriate feed.
Chickens have been eating corn for a long long time. Corn does not worry me. But, based on my educational background in a STEM field, including an advanced degree in a field relating to human foods, I don’t easily fall for a bunch of internet crazy theories. However, GMO is an area of specific concern, bc that can be used in positive and negative ways. But, back to the feed company...as a customer, I would expect to get a good/healthy feed that would not harm my animals. I don’t personify or humanize my animals, so I’m not anticipating their beaks curving into a smile either if I were to provide them with a certain feed with certain ingredients.
FWIW, maybe you need to rename “corn” on your label as “maize fruit” or “seed of the maize plant” or “maize nutrient kernel”. kinda like various natural food companies use “evaporated cane juice” for sugar. It sounds so much healthier!

I should go into marketing....