The Idolmaster: Cinderella Girls

VS

Scum

The Idolmaster: Cinderella Girls is a long-running mobile/social idol management game launched in 2011. It remains notable in Japan with an active niche fanbase, regular events, and ties to the broader Idolmaster brand, but is well past its peak popularity. Its daily active players are likely in the tens of thousands, supported by ongoing in-game events, but fallen off from earlier years. Not an MMO, as it lacks persistent world and massive real-time multiplayer interactions.

Scum is a multiplayer open-world survival game developed by Gamepires and originally entered Early Access in 2018. While it is not a full MMO, it supports servers with dozens of players (up to 64 per server). The game maintains a niche but dedicated following and is frequently updated; however, it has never reached large mainstream status. Based on long-term trends of similar survival games, its daily active player base is estimated to be in the low thousands, and this estimate would hold unless a major relaunch or expansion revitalized the player base.