Story of lost Tetrises

A couple of days ago I wanted to revive my old GameBoy and play oldschool tetris again. I found the apparatus where it should be, but Tetris was gone. There only was some ugly blue cartridge in the GameBoy's slot. Yesterday I visited a friend who is also an Tetris-Addict like me and many others. I asked him if he still has his old handheld and perhaps Tetris. He found the hardware and some manuals. Of course he had the Tetris manual, too, like I do. Now it was getting weird. Two guys and two missing games. So, I searched ebay for tetris. And guess what i found... LOTS of offers! Is there some kind of secret organization thats stealing all Tetris games with the help of little gnomes (like the ones in that south park episode who stole underwear)?