Lots of contradictions. If it really is a moral issue (and I'm not sure even that's true), then it certainly isn't a straightforward one.
Well put. I love the Arduino concept and the way they have executed both their platform and their own hardware offerings. But make no mistake, their platform rests on top of many other independent open source projects, the compiler/linker and Wiring libraries you mentions, AVRDUDE for uploading, Processing for the IDE which in turn uses Java, etc. So the Arduino company added on additional open source contrubution like bootloaders and libraries, designed a very basic hardware platform and released all their contrubutions as open source. I think they in no way expected any 'moral' obligation for users to contribute to their financial income stream other then buying their products if they wished, nor expected clones to not be avaible nor purchased by users. I think the only thing they have tried to protect is their brand name, Arduino, and have asked cloners to respect it when it comes to naming of their products and marketing language.
So I own Arduino build boards, 3rd party value added boards, and simple knock off clone boards and I don't feel I've violated any obligations owed to the Arduino company nor the open source community at large.
Lefty