Did a large numbers of people use those? Legitimate question—it always struck me as a cool initiative for a very small number of people, but only that.
I'd expect most people tech-savvy enough to install Ubuntu would also have a decent enough internet to download a ~700mb file.
Back in the day, not much of my country, or even the US, had particularly fast internet. Nor did everybody have a disc burner in the days before USB booting being supported by the majority of computers' firmware.
If my memory serves correctly, this was 2004/2005, around the time I was discovering my home burnt CDs and DVDs were going bad.
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.
The free LiveCDs were great marketing. As a teenage computer geek, it was way easier to convince casual computer users to try it out when I could lend them a nicely printed CD. And it looked way better than handing them a sketchy CD-R with some marker scribbles on it.
I'd expect most people tech-savvy enough to install Ubuntu would also have a decent enough internet to download a ~700mb file.