

It’s an old joke from back when IBM was the dominant player in IT infrastructure. The idea was that IBM was such a known quantity that even non-technical executives knew what it was and knew that other companies also used IBM equipment. If you decide to buy from a lesser known vendor and something breaks, you might be blamed for going off the beaten track and fired (regardless of where the fault actually lay), whereas if you bought IBM gear and it broke, it was simply considered the cost of doing business, so buying IBM became a CYA tactic for sysadmins even if it went against their better technical judgement. AWS is the modern IBM.
You are correct, I guess “Permanent Ubuntu Live USB” isn’t really accurate as I tend to distro hop. I picked Purple because I was using Ubuntu at the time, then I came to associate that one with “current linux image” and the others were more situational. This was about the same time I came to realize that for 99% of file transfers it was easier to just
scp
things across the network rather than dig a USB drive out of the drawer, so pretty soon after I bought them the only thing I used them for was bootable images, and for whatever reason Purple has been the first choice for that task, so I’m pretty sure it has had more writes than the other four put together.