I was curious too, so I decided to build it. The build process took exactly 5min8sec on a M1 Pro, and was pretty flawless. Only gotcha was that I had to install rust v1.59.0-nightly using rustup because of one of the dependencies.

If you want to do the same:

  brew install cmake git-lfs
  git lfs install
  git clone https://gitlab.com/veloren/veloren.git
  cd veloren
  cargo run

Based on this, I see no reason for a downloadable M1-ready version of Veloren to be made available. Compilation is trivial and fast, so might as well.