If possible it would be great to have a homebrew app that allows for the safe ejection on the SD card. It would seem to be useful, but I'm not sure if anything like this already exists.
Below is my spitballing and rambling, I don't know if this is wrong, but I was assuming that the serial numbers are in a specific format and incremental. As such you could just keep trying until one works. You could potentially cause valid units to become banned, but at some point Ninty would...
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much