Dreamcast because you could just burn a game to CD and run it on an unmodded console

My friend spent summers in Greece with his family. He said there was a shop there where you would give them like a dollars and you would take the game home, burn it, and bring it back. Of course this is what doomed the Dreamcast. Noone wants to make a game for a system where you can just a disc into a consumer burner and copy.