I wondered why too, so I reverted the commit that added the add, pulled in some PRs, and pushed it here. I plan to keep it up to date if there's any interest.
https://notabug.org/anomie/public-apis
Thanks for doing something about this. I’ve bookmarked your fork of the project for future use. That ad was obnoxious and completely gratuitous – unlike the more tasteful Digital Ocean logo at the bottom of https://api.publicapis.org/ and the README page for https://github.com/davemachado/public-api In this case, it’s justifiable as it’s clear that Digital Ocean provide hosting for operating the API server.