References to verbiage for the Remix 3D website suggest that Microsoft might be planning to retire the 3D models' catalog website on January 10, 2020. Users may lose access to current models online.
Remix 3d RSS
While there is still no sign of the 3D-capture app for Paint 3D, Microsoft has rolled out new features to its Remix 3D website, allowing users to locate derived content and individual project objects.