It is a community-driven project, but there is no structured way to join.
You can become a member of the community when Patrick Volkerding or one of the lead devs ask you.
I've been in contact with them for a while and ultimately decided against contributing.
They acted too much like old men when you step on their lawn, and I don't see the point in this distro anymore, apart from it being a blast from the past.
Literally everything it does is done better by others now.