since a few weeks we’re on a quest to discover how to link Value chain mapping with Platform Design, more precisely with our Platform Design Toolkit.
I think this last post
Understanding Platforms through Value Chain Maps – Stories of Platform Design available at: https://stories.platformdesigntoolkit.com/platform-value-chain-z-shape-385f759faffa might be a very good resource for you to start from.
We believe that VCMaps of “platforms” or aggregators are Z-shaped instead of C-shaped:
Here’s the recap page https://medium.com/platform-design-toolkit/digital-markets/home