I don’t think there was an intention to offend anyone. Of course we all know that PowerPC Linux contributors are few and far between and any support is better than none.
Fortunately, PowerPC as a platform is not limited to only 12+ year old Macs, so I can imagine support for Linux/PPC will continue on in some form or another. Regardless of Debian’s official PPC finish line and the ripple down effect for Ubuntu/Lubuntu, Linux/PPC aficionados will continue to build and hack away at the OS.
Fedora Server 26 is a modern (July 2017) PPC64 release for G5, POWER8, POWER9, etc. I haven’t tried yet, but it should be possible to add the workstation packages for a complete desktop environment, I just don’t expect to find much in terms of Mac-specific technical support when things don’t work.
With Linux, it comes down to the user’s nous and commitment to make it work in some form or another. If the end user wants an easy “It just works” solution then Linux (especially for PPC) is not the best choice.
It’s really not that it has been intentionally designed to be difficult, it’s more that the designers are often limited in scope to working with only technically minded users and not often considerate of anyone with less experience.
This is why Windows and Mac are always going to be more popular. They are massively funded to be designed for ease of use. In most cases, the end user can click their way through a task such as installing software or setting up hardware without any understanding of what’s going on at a lower level.
Often, the simplest “easy to use” software designs are the most thoroughly thought through, extensively focus group tested and massively $$$ expensive processes. It’s this expense that indie / open-source programmers can’t afford.
This could explain the typical entry level requirement for Linux.