No clue how they're gonna do it but I have done this for rom hacks before. I just put a number in the rom I can check if my stuff ever got leaked. Like 0 would be this person, 1 for the next. Thankfully I never gotten a leak before lol.
Everdrives supported the msu-1 for ages so you're probably able to play the msu-1 hacks just fine on real hardware and no one is gonna make a CD drive for the SNES in current year that would suck compared to the super fast loading of a cartridge...