I wonder why the world outside a limited subset of the Linux ecosystem is - at most - an afterthought for Fediverse developers.
I hate to break this to you, but OpenBSD is an antiquated OS masquerading as a modern one, and the OpenBSD's lack of willingness to support modern standards results in the difficulty you're having.
OpenBSD feels like it's been duct taped together for decades. Anything "new" seems to just be, "sorry, not possible." The OpenBSD kernel doesn't support WiFi 5GHz. The OpenBSD kernel doesn't support even the minimum subset of isolation features in order for Docker to function properly. Why? Because OpenBSD refuses to add these features to their kernel. There are very likely other syscalls and basic features any given open source project needs, even if it's not being run in Docker, that simply do not exist under OpenBSD due to the very limited kernel it provides.
You're upset because open source projects don't support a platform that is old and developer-hostile. Turn your frustrations on OpenBSD - these projects would gladly support OpenBSD if they could.