It is quite strange. I realize PureOS has been a topic of discussion for a
while regarding an addition to the gnu.org recommended gnu/linux distros, but
there are so many free as in freedom distributions that I'm sure have been
waiting approval at this point.
I also realize the difficulty in deeming a distribution 100% free as in
freedom. It is likely quite a bit of work, and they probably don't have many
people working on approving distributions.
I was also disappointed to see they are making the move from SysV init to
systemd, but I am certainly pleased nonetheless to see that more free as in
freedom gnu/linux distributions are being added to the list.