Crowding out OpenBSD

"BSD is a place where developers can experiment with different approaches to kernel design, filesystems, packaging systems, and more. OpenBSD remains a center for security-related work that does not exist to the same degree in the Linux world."

There are PaX and Grsecurity projects, and linux distributions which include them by default: Hardened Gentoo, Alpine Linux, Atomic Secured Linux, etc (?). There's Openwall GNU/Linux, with its secure userland base.

So in fact, security-related work does exist in the Linux world. Maybe even to a bigger degree (look at what's done in the last 4 years) than in OpenBSD, which didn't innovate anything on the field of security for a long time.