Copy paste response from @Swed in discord
We're in the process of transitioning all the maps off fastdl to a workshop collection due to an ongoing issue with fastdl, and valve is taking their sweet time approving said collection. We appreciate your patience in this matter as it can definitely be frustrating finding the popular maps gone, but with fastdl broken, anyone without the maps previously downloaded wouldn't be able to play the server anyways. This transition is obviously taking longer than we'd like as you can tell. There's also a separate known issue regarding the nomination plugin that I'm in the process of fixing. Anyways, all of this is to say no one is pulling the "popular" maps off war3 arbitrarily.