@Frodon, AmiGR
Look, it's already been posted---and acknowledged---that MorphOS required AmigaOS binaries to run. That means that they used Amiga source code. They might not have compiled it, but because they used the compiled product of that source code, they used the source code. Everytime someone purchases a computer software product, they do so according to a particular license. If their use of that product violates the license held, they are using that product illegally. Whether source or compiled product is really immaterial. The use is still illegal.
The MorphOS team has been openly accused of illegal use of an Amiga product. So far as we know there has been no slander or libel suit forthcoming, but there has been an admission that the need for such product has been removed.