> Always receiving legal assent to sell fruit juice [nuts are fruits] with a mammalian name.
If you mean things like oat milk, it's unlawful in the EU (and I think still the UK) to label plant-based alternatives as milk or dairy under EU Regulation 1308/2013.
Which is absurd, since
> In English, the word "milk" has been used to refer to "milk-like plant juices" since 1200 CE. https://en.wikipedia.org/wiki/Plant_milk
It's like complaining that modern electric irons can't be called irons because the heat plate doesn't have iron in it.
That is referring to coconut milk, which is exempted.
The other uses like oat milk come from 1980's ads. It's so recent that the JM Smucker Company tried to trademark it.