So, the way you phrased it made me believe that this "openpilot" software is unaffiliated with Comma.ai. But they are, in fact, the owners and maintainers of the openpilot repo and link directly to it on their website.
Yes - Comma owns that repository and there are instructions on how to put the software on Comma devices. But then also lots of commits are from authors not affiliated with Comma and my understanding is that quite a few users of that software aren't actually using the official repository, but various forks maintained by third parties.