I'd expect most people tech-savvy enough to install Ubuntu would also have a decent enough internet to download a ~700mb file.
This was also around the time I would often brick my primary (only) workstation for whatever reason. Having a properly mastered Live CD was super useful.
I would order at least two with every release cycle for a few years at least.
Thankfully, I saw the light early with Ubuntu-server, and stayed with Debian. Ubuntu-desktop makes for a good enough live / recovery / troubleshooting environment, but not sure I’d use it for anything more.
we installed ubuntu with friends in freakin junior high school. it's not like it's rocket science...
OTOH the village where I grew up as a child only got DSL > 512k around 2008 iirc.
So yeah, lot of people got those.