I think the goal is efficiency. The realization that having a shared data strategy across the industry benefits everyone, including regulators, and make technology stacks more efficient.
Of course, like any other tech company, I think there's the desire to mutualize the cost of maintaining a core component (e.g. Facebook with Cassandra, Google with Kubernetes, etc).
Purely speculation, but introducing a dependency that their competitors may need to rely on could create a new revenue stream through a service-like business model. Community contribution could be invaluable as well, but judging by the repo status, it isn't very popular...yet?
