There are actually very few GMO crops available commercially. Mostly corn and wheat. The "No GMO" label is meaningless for most products that don't use these ingredients
Yup. I would say at this point 99% of the cheese consumed by Americans is produced with GMO bacterial rennet. I've contacted maybe a dozen cheese producers and they've told me the same thing. It's not just about lower cost, but that is the biggest factor, one producer told me it's also about bacterial rennet being much more consistent and predictable.