If a person who is able to dump Gameboy ROM gets a cart with that game, and if the cart is not heavily protected to prevent being dumped, dumping the ROM would be possible... Well this may sound dumb but I think the same applies to every other existing Gameboy games and no one can be so sure about this kind of thing.
I owned a multicart with this hack long time ago, and I found the game too disappointing to be the sixth entry in the Kureyon Shin games. (I liked 4th and 5th one quite much and I didn't know that this game was actually a bootleg at that time) I just traded the cart away and I've never seen a cart with this game from that.