Using a single license disc on more than one CPU was technically illegal. Not condemning you as I may be guilty myself.
I am a huge fan of Linux and open source. However, my experience with installing on a G4 or G5 is that the system can be finicky. Graphics acceleration or audio may not work without modifying config files or searching for a needed software package. And, to a layperson, the installation process itself may be confusing. I tried Linux before finding MorphOS.
Yes, Leopard is still usable and TenFourFox is a godsend. But, the core of the operating system hasn't been updated in at least five years. Again, I keep presenting that MorphOS is currently maintained, stable, and fast. Also, the installer is easy understand, takes less than 5 minutes to complete on my Mac Mini, and everything works without the need for me to edit config files if I don't want to. There's also a ton of abandonware available thanks to Amiga compatibility in addition to current development projects. Anyway, I don't wholly disagree with you. I'm telling you this is another option that I and others find valuable and there is no harm in me suggesting it.