Now that Playcanvas has a built-in Sketchfab support in the Asset Store some people may find this helpful; in Hugging Face spaces, someone has build a GUI for querying Objaverse 3D library of 800K+ models, which most (all?) seem to be Sketchfab models with attribution licenses.
What’s great about it that you can search via text prompt or by uploading a reference image or even 3D object.
Not only that, but you can filter the results based on things like min & max face count.
Once you’ve found the model you like, you can just search for it in Playcanvas Asset Store, in the Sketchfab tab, by using the model name, for instance.