I really like the idea of setting up guard-rails like this to embody cultural values early on in ways that keep the organization accountable to them at scale and I wonder if something similar could help OSS. It's not hard to imagine a similarly structured pledge being adopted by companies and being popular with developers. It could be structured in hours or money, executed with developer time, donations, or hosting OSS developers like Stripe has done.
If I allow myself the thought exercise of what happens if something like this started to see adoption, I imagine we'd see projects beginning to license themselves favorably to companies who make this pledge in a variety of ways.
At any rate. That's roughly what I've been noodling around with regard to this problem.
[1] http://onepercentfortheplanet.org/ and I highly recommend Yvon Chouinard's book Let My People Go Surfing, which was where I was first exposed to the idea http://www.patagonia.com/us/product/let-my-people-go-surfing...