There exist multiple CC variations, this instance is Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

https://creativecommons.org/licenses/by-nc-sa/4.0/ the CC BY-NC-SA 4.0 wouldn't let you sell it no

It's just the external topology so it's really only going to be useful for making things that attach to the controller (skins, mounts, accessibility adapters, etc) or just toy models. Valve asks you to contact them if you want to sell an accessory using this model.

You could use the shape of the controller, but I don't think that is really giving much of an advantage to third party manufacturers. Scanning the shape of the controller and creating a clone with that shape is the easiest part of creating a generic competitor.