Sorry, that's exactly what I was saying. Mutable & MTM both show how CC-BY-SA licenses (with commercial use permitted) can be very useful.
Olivier is doing very well selling readymade modules with CC-BY-SA licenses that also permit a hobbyist community building DIY versions and selling PCBs. I think it's a very positive model that has created a strong community creating alternative firmware etc.
I don't sell modules or kits at all, but my license has allowed others to sell and distribute kits or finished modules (Thonk, SynthCube etc) of my designs. My main goal has been to get my designs used by musicians, and that's working very well.
I just said that I understand Johannes' concerns, because many people are nervous about CC-BY-SA models, fearing piracy or rip-offs. I personally think that with a BOM as complex as Axoloti, and a relatively niche audience, this might not be a big risk.
There's also a lot you can do with brand names etc; Anyone can make and sell a finished clone of a MI Clouds, but they can't (I don't think) call it "Mutable Instruments" or "Clouds" or use the cosmetic design. That's how Arduino have worked (you can make a CloneDuino, but not an Arduino) although they obviously now have their own problems closer to home in Italy...