Whey is the primary protein in milk and is consumed by everyone serious about building their body. Clearly you don't understand why milk proteins are some of the best available for human consumption. Complex BCAAs provided by milk are amazing. Soy milk has limited BCAA. Dairy products are some of the best products for human thriving.
Farms - especially dairy farms are notoriously high touch and low margin. Soy production on the other hand is cheap and easy. You're lost.