When downloading an auto-converted glTF model, the scale is incorrect. It doesn’t look like the Sketchfab glTF exporter uses the FBX scale factor correctly. This problem is also not limited to the auto-converted FBX files.
I’m a member of the Mozilla Hubs team and we’re currently using the download API in Hubs and our editor Spoke. When our users use assets from Sketchfab in Spoke they need to scale most FBX assets to 0.01. This suggests that the FBX to glTF conversion is not handling converting from centimeters to meters. glTF specifies that it’s units should be in meters, so it would be great if the auto-converter would convert to meters whenever the original file format has information describing its units.
IMO Sketchfab has the best and biggest repository of glTF assets out there, thank you so much for all that you do!