This. Technically it's not "open fucking source" but overall you're right; honestly these arguments often ignore the spirit of the open source ethos. The source code is available. It's not a coincidence that these non-foss node systems have the much more ambitious goal of creating a general purpose server application platform, which is awesome and in fact is critically important for the future of free computing. It's a lucrative platform that can easily be hijacked, so they need to use a different license. It's fine. I love GPL, I love MIT, but we shouldn't limit ourselves to using only these "technically FOSS" tools in our current complex adversarial environment.