What Google really pushed forward was SaaS and the free price tag was a trick to make it seem as good as open source.
But when it comes down to it, Gmail is worse than Windows 7 when it comes to user power. At least you can use windows 7 without a constant connection to Microsoft.
IBM has more of a consultancy perspective: they want rheur business customers to pay for services provided on top of existing solutions. And open source platforms make it easier to sell custom extensions.
I will say, however, that your claims would be challenging to verify or refute -- quantity of contributions may not be a good metric, and it appears your Gmail/Win7 comparison is based on a single dimension (user power) which is further limited to one dimension of that dimension (whether it requires a constant connection).
You may be correct, but your comment didn't provide much of an argument to get me to think more of the problem. It just seemed like you needed to negate my (also unsubstantiated but admittedly devil's advocate position) out of some sense of anti-google sentiment.