This has been brewing for a very long time, and he's by no means the only person or even the best person making these points. Open source dates back to the 1980s but really took flight in the 1990s with Linux, Linux distributions, and the mainstreaming of the Internet. Back then it was mostly a movement for software freedom and openness in contrast to closed source software like Windows and macOS. While it obviously…
80's or 90's open source? There was no effective internet. There were only BBSes and Compuserve. FOSS took off in the 00's.
https://en.wikipedia.org/wiki/Berkeley_Software_Distribution
Initial release: 1978
Just because there was no effective internet doesn't mean computers didn't exist and people weren't working on projects together.