> a developer ecosystem tipping the incentive scales such that companies like the Googl/Msft/OpenAI/Anthropics of the world WANT to contribute/participate

I think Apache Arrow has achieved exactly that [1]. It's also very file-friendly, in that Arrow IPC files are self describing, zero-copy, and capable of representing almost any data structure.

[1] https://insights.linuxfoundation.org/project/apache-arrow/co...