Forma 3D Toolkit adds the store features of the Forma 3D theme:
The blocks are drawn by the Forma 3D theme, so they show nothing with another theme. The 3D models on product pages are shown by the free 3D Viewer plugin, and the store runs on WooCommerce.
The plugin does not connect to any external service.
Demo 3D models: Poly Haven (CC0, https://polyhaven.com) and Khronos glTF Sample Assets (https://github.com/KhronosGroup/glTF-Sample-Assets): SheenChair (CC0, Wayfair), GlamVelvetSofa (CC BY 4.0, Wayfair / Eric Chadwick), SheenWoodLeatherSofa (CC BY 4.0, Eric Chadwick / Darmstadt Graphics Group).
Demo product photos are renders of these models and use the same licences.