It's very weird that Linux is broken up into Ubuntu, Debian, Arch, Linux (non-WSL), Fedora, etc, etc. but none of the other OSes are. Example: Windows isn't broken into Server 2022, Server 2025, Windows 10 home, Windows 10 iot, Windows 10 S, etc, etc.

It's very hard to tell what the total numbers are as you can't just add these together, since an indivdual might use several.