https://www.bleepingcomputer.com/news/google/google-is-closing-3d-model-site-poly-to-focus-on-ar-experiences/

Google is shutting down its 3D model sharing site Poly in 2021 to focus their resources on building AR experiences.

Google Poly allows designers to upload their 3D models to a gallery that can be used by other members in their projects. Models uploaded to the service can be freely used in other projects, as long as attribution is given to the original developer.