[mdevaev]

It's open source, but not open hardware. All the code is completely free, so closed hardware is our way of monetization to continue development.

[atok1]

Would be awesome after you make some money back if you could open hardware it for those of us who require full trust!

[magicalhippo]

What open-hardware Raspberry Pi alternative would you be using with this then?

After all, hardly any point of having a open-hardware HAT if you connect it to a closed-hardware Raspberry Pi. Even if the full schematics etc were available, the processor on the Pi is anything but open.