If you think of carbon credits as pricing negative externalities (public bads), public goods funding is pricing positive externalities. 

The perception is that public goods funding is a charity, where funding should go to the projects who need it the most. This is understandable if you look at it as a single shot game

But in a repeated game, this means that the only way to receive public goods funding is to be underfunded. Resulting in a state where we’re doomed to live in an ecosystem with underfunded public goods.

The goal should be to reward impact. If we do this reliably, in a repeated game, building public goods, which have a large impact, becomes highly profitable. 
Collaboration becomes the winning strategy. Growing the pie is what’s important.