The problem with projects like this is most (not all of course) GBA manufacturers turn around and sell these games to anyone else that's interested rather than keeping the exclusively to the original purchaser. I noticed a half-dozen different GBA manufacturers on a certain website selling the English translated version of Mother 3 for around $4 USD each. Someone had originally went through them in the past for a production run of the cart and it's now openly for sale to anyone.

While the original owner/purchaser in that particular instance has no legal rights to the product it sucks when that happens to a real, original homebrew title. That's just a chance you take when dealing with overseas manufacturers unfortunately.