There are distributions that have gaming as a core part. Then there are those that are just bleeding edge for being bleeding edge. Rolling distributions are also more likely to have the lasted versions around.
On the other hand if it's a distribution meant to provide a solid and stable base to work of from then it usually takes time for versions to tickle down. Based on some Ubuntu telemetry 0ad has probably some 300'000+ installs on Linux. Single player don't need the latest version, certainly not zero day bumps.
There is also the option to build from source. While that may sound daunting most long term linux users (or open source user on other platforms) will start doing it at some point and realize it's not harder then learning to drive a bicycle. That will allow you to use a fix to one of your issues right after it got committed without having to wait for a release (every day is release day ). Also instead of the some 20'000 packages your distro offers you have the whole world of open source software at your tip.
That said, there is a Flatpack for 0ad and an AppImage will be provided for the next release as well.
According to
https://en.wikipedia.org/wiki/PureOS
In my opinion, it's time to choose something else.
This is what the 0ad versions supported by Linux distributions look like.
https://repology.org/project/0ad/versions
I suggest stable Debian 13.1 Trixie:
https://cdimage.debian.org/cdimage/release/13.1.0/amd64/iso-dvd/
https://packages.debian.org/trixie-backports/0ad
Regards.