I believe people should be free to choose whatever license they think fits their project best, and tend to trust their judgement and goodwill. That said, I thi

I believe people should be free to choose whatever license they think fits their project best, and tend to trust their judgement and goodwill. That said, I think strongly copyleft licenses even in commercial hardware are underappreciated. Arduino is the great example: sure, it has got tons of clones. But that's kind of the point: that other people make it, and get more people using it (Arduino themselves focused on quality of their in-house produced, and also goodwill of customers). If you have it open source, people can actually copy and modify and improve it, that's the spirit -- although I'd agree it may be tough to secure enough funding from first party product sales to sustain development of the project. In that case, I'd suggest looking for a stable stream of sponsorships/donations, through platforms like patreon or liberapay. And of course, if you're a user, make sure to donate!