I just quickly wanted to say that this seems related to impact certificates: https://forum.effectivealtruism.org/tag/certificate-of-impact
There have been a few forum posts on this topic, you can just search the forum (or google) for “impact certificate” and will probably find some interesting arguments.
Note that Vitalik Buterin has also recently started promoting related ideas: Retroactive Public Goods Funding
Thanks for linking to that article, which I hadn’t seen. I updated the ‘certificates of impact’ entry with a brief summary of the proposal.
I think the consensus around impact certificates was that they seemed like a good idea and yet the idea never really took off.