Magma itself came out of Facebook Connectivity and has nothing to do with crytpo AFAIK
> Magma is an open-source software platform that gives network operators an open, flexible and extensible mobile core network solution.
It's mostly about packing network processing stacka onto pc based systems.
There's a couple major groups (FreedomFi and Pollen) that are leveraging Magma's software stack to run their cellular networks, yes - those are probably the two largest Magma users right now that are publicly known and where a lot of the development resources (seem) to be going (mainly support for eNodeBs - LTE base station radios - that the FreedomFi/Pollen projects primarily use and are low cost COTS solutions).
But anyone could deploy a Magma Orchestrator in the cloud, build local Access Gateways, link everything together, and roll their own cell network around Magma's setup, no crypto required. CBRS LTE changes everything in the US.
"Magma provides a new way to incentive users to create their own peer to peer networks that provide cellular network infrastructure by offering cryptocurrency rewards."