I think something like this would probably be done user side, maybe with some option to share it, much like the “multireddit” feature of reddit. Each individual community is still moderated and run by their mods and local instance, but the user can choose to aggregate multiple mags/communities together.
Battlebit is just $15 on Steam and has a great amount of content, quality servers, and old school Battlefield-style gameplay. Super low spec graphics. Can really recommend it to folks looking for the above