Node.js has been super popular for the past few years and it's built from mostly MIT style licenses. It's so hot that Microsoft has made a big effort to make it usable and provide tools to work with it on Windows. Nobody that I know of has come along and taken this product, re-branded it and then pawned it as their own creation.
I understand that the point of the Affero license is to prevent "Tivoization" of a product, but it seems to come at the cost of not being able to attract a large base of developers to contribute to the project, since everyone would rather be working with more liberal licenses.
I also might point out, as a person working on a proprietary service, it's in our interest to contribute upstream. Who wants to maintain compatibility patches? It's in EVERYONE's best interest to have solid, open infrastructure used by everyone (yes, even evil closed companies like google)
It's good enough for Linux.