Canonical has put a lot of energy into open source for a decade - contributing code and putting free software into the hands of millions around the world. It should be entitled (your word, different usage) to write proprietary code if it thinks that's the right approach.

If you constantly burn the companies and people who actually work on open source for not meeting the purity standard then you make it a hard environment. Honestly, there are way more fully proprietary software companies out there, or companies using but not contributing anything to open source to have a go at.