It's a cool project but it's not open-source. CC BY-NC-SA is not an open-source license, since it limits what the users can do with the code. This is openwashing.
Yup. No catch. All Software and Hardware files can be found in the Engineering section and the Github page under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License”.
This is in the Frequent Questions section. (You need to click on the question to see the answer.)
