[emaste]

> not due to morals, but due to it being the best option for themselves

Indeed, and this is why the same thing happens in the BSD world. There are many examples of large and small companies, competitors, working on the same parts of FreeBSD.

Enlightened companies contribute to Free and Open Source software because it's in their best interest, not directly because of the license. Conversely, there are countless examples of companies who don't think it's in their interest, and willfully violate the GPL.