To prevent people from making illegitimate Amiga joysticks, the entire community will have to help police and not just give up out of disgust.
Everyone is trying to profit from the "retro" market, quite a few of them without proper licensing.
Opposition to the Clone-A and MiniMig projects because of piracy potential is the same thought process that wound us up with viral DRM, not being able to play some DVDs on video cards with composite output, and so forth. This is the thought process where everyone is a criminal before ever having the chance to perpetrate a crime.
Keep on trucking Dennis, Jens, and Oliver. I will now refrain from mentioning ChipRAM :-D