Does this also apply for DIY modules? The shop/store criteria won't really fit there, but there are folks out there who provide open-source layouts for free - and I'm not talking schematics only, but ready-made Gerber files to have a decent module made. While HAGIWO, for example (as a well-known and highly represented creator of module designs) wouldn't qualify as he's building perfboard mostly, his schematics have frequently been incorporated in PCB-based modules, so I'm suggesting to add those, as the entry barrier in DIY is significantly lowered there, compared to providing schematics and code only. Crediting the original author of the design should however be considered polite and common practice. Thinking about Testbild in particular, as I have added a couple of his modules recently. While he offers some of HAGIWO's modules, he's also done outstanding work on his own, building something what he describes himself as a Maths clone without using their documentation, based on VCS designs from Voxmachina. So, while he's not selling anything, he should somehow be represented in some form IMO.