MTS: one Factorio multiplayer server, many teams, each its own force on its own surface, holding a private copy of the same map. Same seed, separate research, zero resource conflicts. Race a friend from an identical spawn, or put them on your team: co-op or head-to-head, with per-player follow cams. In the spirit of OARC's separate spawns.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.