Discussions [0] (120 points, 3 days ago, 87 comments) [1] (113 points, 15 hours ago, 106 comments)

[0]: https://news.ycombinator.com/item?id=40375029 [1]: https://news.ycombinator.com/item?id=40397789

The obvious reason behind this is that otherwise code may be copied into the NetBSD codebase which may have been licensed under an incompatible (or proprietary) license.