Last Fortress: Underground

VS

FiveM

Last Fortress: Underground is a mobile real-time strategy and survival game that gained popularity for its blend of base-building, resource management, and PvE/PvP features. While it is not a top-tier mobile hit, it maintains a steady audience due to frequent updates and in-game events, typical of free-to-play mobile strategy titles. However, it does not receive major media coverage or chart-topping download numbers, so the player base is active but mid-sized.

FiveM, released in 2016, is a popular modification framework for Grand Theft Auto V that enables custom multiplayer servers, especially for roleplay communities. Its active modding scene and the enduring popularity of GTA V have kept its playerbase strong, typically with hundreds of thousands of daily players. However, it's technically not an MMO as individual servers usually host dozens to a few hundred players, not a persistent shared world for thousands.