Some peoples just tried to remake the loved original halo reach map " the cage " ( or uncaged), i think it would be introduced in multiplayer, how a map create on forge can be approved and published by 343i?
Forgehub is a great place to start. They have map contests that can lead to multiplayer map playlists. There are many people that use the site to critize maps to help create the best a map can be.
It’s also a great site for spotlighting maps.