I have a concern regarding Sketchfab included to this list. I know many artists who avoid using Sketchfab for a simple reason: it is very easy place to get your asset stolen. Whatever is displayed on the Sketchfab is already selling on dozens of pirat platforms. Especially chinese ones. If you are considering adding online 3D viewer, please make sure the viewer corrupts the model for the thiefs and that source files are stored separately and protected. It can be done unnoticable for customers.
The lifespan of the assets is not very long. And they sometimes leak after first sales. But 3D viewers can reduce it even further.
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