Ha....There's a lot more about the service (good and bad) that I dug up here:
https://variety.com/2018/gaming/new...e-multiplayer-nes-cloud-saves-faq-1202942042/
My least favorite is the requirement for a weekly check-in to play NES games offline. :/
It's the same with Steam. I have to regularly check in with Steam via email authentication every week because I have 2 PCs logged onto Steam in different places about 50 miles apart.