One existed, it was pulled from the market in the early 2000s. There's still a dog one, and there is at least one which is in late stage trials in the US today.
I have so much hope for lab grown meat and animal byproducts, but between opposition to "gmos" and agricultural lobbying, I think it will take a century before it's the norm.
Yeah, milk is disturbing. Most people's intuition about what is most humane to eat does not match the objective cruelty of what they consume. The life of an average cow versus the life of an average chicken for instance.
I replicated this experiment on several production codebases and got several crits. Lots of dupes, lots of false positives, lots of bugs that weren't actually exploitable, lots of accepted/ known risks. But also, crits!