> The person I replied to said the "open" prefix means it's made by the OpenBSD team and I am responding to that.

What was said is that the OpenBSD operating system folks chose to use the Open— prefix for all their other projects ("They simply ran with the naming convention."). What was not said was that all Open— prefixed projects were from them.

You’re inventing an argument I didn’t make. OpenBSD doesn’t own “open”. Literally no one is saying that. What I did say is that openrsync is named that because the OpenBSD team names their projects that way. The “open” in this project means that it came from OpenBSD, not that that it’s in contrast to rsync being proprietary (which it isn’t).