The default init.d/radiusd defaults to assuming that radiusd will run as root. This is probably a bad idea and should probably default to the created radius user. Reproducible: Always
For the init script to work with the radiusd user as default, we would also need the conf.d script to have that as default, and /etc/raddb/radiusd.conf should set the user = and group = accordingly. Additionally, pkg_config() should change the ownership after ./bootstrap has run. It kind of makes sense to do this when the ebuild introduces the user and group in the first place.
Should be fixed by commit 9a502883369ac2d353e09468aa6d0ac71c5b73a2 Author: Matt Turner <mattst88@gentoo.org> Date: Wed Nov 23 10:19:55 2016 -0800 net-dialup/freeradius: Run service as radius user by default.