Yeah, mylink is a huge disappointment... initially it was supposed to be upgradeable and have lots of apps, but it never happened, and gm seems to have swept all that under the rug. I'd love to find an engineer in that division who could tell us what happened. And as a consumer, it's infuriating when companies get away with promising something like that and then not delivering.
This hack seems cool, but lots of mixed results, so I don't think I'll try it just yet.