Merge pull request #690 from ccerv1/main

add: data on oss funding vs vc funding

figs/data/oss_funding/oss_funding.csv

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+Source,Amount
+Ethereum Foundation,22000000
+GitHub Sponsors,33000000
+Open Collective,58675491
+Gitcoin Grants,60000000
+Optimism RetroPGF,121000000
+Linux Foundation,913000000
+Venture Capital,1357000000000

figs/data/oss_funding/readme.md

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+# OSS Funding
+
+![](./oss_funding.png)
+
+This figure shows a survey of open source software (OSS) funding sources. It is not complete, but it does provide a snapshot of the landscape and some of the major players. Where possible, we have included the cumulative funding as of March 2024.
+
+OSS Funding Sources:
+- [GitHub Sponsors: Cumulative, as of March 2023](https://github.blog/2023-04-04-whats-new-with-github-sponsors)
+- [Gitcoin: Cumulative, as of March 2024](https://impact.gitcoin.co/)
+- [Ethereum Foundation](https://practicalpluralism.github.io/); see also [here](https://blog.ethereum.org/2023/06/15/allocation-update-q1-23) and [here](https://blog.ethereum.org/2023/08/15/allocation-update-q2-23) 
+- [Open Collective: Cumulative, as of March 2024](https://blog.opencollective.com/fiscal-sponsors-we-need-you/)
+- [Optimism RetroPGF: Rounds 1-3](https://community.optimism.io/docs/governance/retropgf-3/)
+- [Linux Foundation: Revenues 2011-2022](https://projects.propublica.org/nonprofits/organizations/460503801)
+
+The VC funding data is from the same source as quoted elsewhere in the book in order to be consistent:
+- [NVCA](https://nvca.org/pitchbook-nvca-venture-monitor/)
+- [Raw data](https://nvca.org/wp-content/uploads/2024/01/Q4_2023_PitchBook-NVCA_Venture_Monitor_Summary_XLS.xlsx)