Aplaybox is the go-to platform for Chinese MMD creators (often using MMD, Blender, or Source Filmmaker). They produce massive amounts of Kpop content.
You cannot monetize videos using these motions or sell the motion data. K-pop choreography belongs to the original entertainment agencies and choreographers; MMD motions are strictly for fan art. To help me tailor future MMD resources, let me know: Kpop Mmd Motion Dl
Some motions are locked behind private NicoNico communities or specific Discord servers to prevent unauthorized re-uploading. Aplaybox is the go-to platform for Chinese MMD