[2022] Acquired copyright?

Originally posted by Lowry: I'm not sure Gaijin can use ip from the Dune without acquiring the rights first, and if they did how much capital did they throw away for an april fools gag?

Source: trust me bro

Never been on a desert, but I am sure dunes are pretty common there.
We have a lot of them in game since years on many various maps.
Since when they are a copyright material?