Pretty sure you’re thinking of tzdb, the time zone database: https://onezero.medium.com/the-largely-untold-story-of-how-one-guy-in-california-keeps-the-worlds-computers-on-the-right-time-a97a5493bf73

An adjacent and thematically resonant story is the volunteer effort that powers curl, which so many people use: https://thenewstack.io/the-world-runs-20-billion-instances-of-curl-wheres-the-support/

When the first DVD cracking util was released, DeCSS, it violated the DMCA and people were getting sued and threatened with felonies for sharing it. Very quickly people figured out loopholes to make it an archivable creative work, like putting it on tshirts and encoding it as a prime number: https://en.m.wikipedia.org/wiki/Illegal_prime

The first thing that comes to mind is Meshtastic: https://meshtastic.org/