I didn't see any reference to G-code in the article. I think the worry is that they will introduce a closed, proprietary standard in an attempt to build their platform.

I'm a bit conflicted. On the one hand, G-code is very compatible with the open source ethos, but on the other it's a very old standard that was originally intended for plotters. I'd love to see something better replace it that can say, use bezier curves.