The fact that Nintendo created yet another variation of the Game Pak allowed them to retain control over distribution. Although, since this console never took off, bootleggers likely didn't bother.
Furthermore, the console lacks both copy protection and region-locking mechanisms. Games imported from America and Japan will work on either console. Also, assuming someone is willing to manufacture their own Game Paks, homebrew development is also possible without restrictions.
The last time I checked, Flash carts were theoretically possible, but only a handful reached commercialisation in recent years.