Even if the moderation was flawless, models would STILL be leaked - here’s why:
RBXM. If somebody buys a model, then saves it as a rbxm, the rbxm doesn’t need to go through roblox to get to the next person; it could go through a discord server or a chat or something. 3D Previews would be impossible because if you start a browser with 3D Ripper DX then you can steal the 3D preview, and then rebuild it based off positioning data from the rip. Nobody’s safe D: