@PetroRie
But lets be honest, everyone who uses RetroPie or any other emulator got their roms illegally.
I certainly don't want to come off as a complete contrarian, but this is also a common misconception. I live in America and there is indeed a legal source to obtain just about any ROM you would ever want. I won't go into the specifics of how and where, as this does not carry over into other countries, but there are also a few other legal ways to obtain ROMs throughout the world as well.
About Kodi I think the devs are more worried about people selling boxes loaded with plugins ready to stream movies and tv shows.
This is indeed more troublesome from a legal point of view, but they've also gone on record several times about their disappointment and disillusionment in seeing something they've worked so hard on being almost universally mistaken for something that stands directly against their own personal beliefs.