Yeah, take your pick :)
I'm going to be dumping some ROM's fairly soon from another synth just so I have a back up, I suspect that's where these ROM images may come from; people doing similar back ups. If I do the VZ-8M (and I may as well) I'll post it here. No idea about the hacking / reverse engineering I'm afraid, bit advanced for me.
As I understand it, some Eprom's start to get a bit unreliable after 30 years or so, so having a back up of the image and the ability to burn it to a new chip is potentially useful.
The VZ-8M certainly seems very stable and reliable compared to some.