World of Sea Battle

VS

VRChat

World of Sea Battle is an indie open-world naval action game with RPG and simulator elements, developed by Thera Interactive. While it features open-world and multiplayer tags, the lack of wide recognition, a major publisher, and mainstream coverage suggests a small but steady niche community. Its indie studio background and limited marketing mean the player base is likely in the low hundreds daily. I do not classify this as a true MMO as there's no clear indication of massive concurrent player interactions.

VRChat, released in 2017, is a social platform supporting large-scale, persistent worlds and user-created content. Though its peak popularity was in the late 2010s, it retains a dedicated community, especially in VR circles. Player counts have stabilized in the tens of thousands daily due to steady user-generated content and ongoing VR relevance.