IIRC they can't be sold as "milk" inside the EU, they're usually called some variation of "beverage" or "drink". The only product that can be labelled as "milk" has to be produced, as you said, by mammals.
Just in case your preference for Warsow is solely based on the lack of promode in QL, I'm really glad to tell you that there is promode now in QL, and there's been for a couple of months now.
Granted, it's a premium feature and so on but there are some public promode servers (user-spawned), specially CA and CTF, and I've been having a lot of fun there.
The world record is 15:01.
https://www.speedrun.com/pop1