Making open source software has that side effect. You have a community contributing and testing your software, but on the other hand, others can use it and modify it for their own purpuses, they have to understand this.
From my side, I'll promote as much as I can their work, because I think (even if I don't have a MOD Duo YET) it is a fantastic job, and very valuable for its price. But I am a maker, and I need to design and make a pedal myself. I was about to make that software (mod-host and now mod-ui), but it is already done and available. I think I'll do a favor to them by using, testing and promoting their software and products. My project is not a commercial one at this moment, if someday it is, I will ask for permission to use mod-host and mod-ui, or will develop my own software (open source, of course )