> I'm not sure what the farmers are hoping for.

Effective subsidies, like when margarine legally wasn't allowed to be sold yellow:

https://www.nationalgeographic.com/culture/food/the-plate/20...

Force the vat-meat makers to call their product something unappetizing, and save the cattle yards.

The gap between lab grown diamonds versus those found in the Earth is much narrower than lab grown vs farm grown meat today. You need special technology to detect one from the other.

With time, it'll be an increasingly losing battle for the farmers.