It’s currently on a free weekend promotion on steam. You can play it either way.

I’m not educated in this matter at all, this is just a guess with no basis.

A “cloud chamber” is a device used to detect radiation, and it has been that for a long time. Perhaps they wanted to distance themselves from that device, hence the strained acronym CLOUD.

Yep. Its not the answer OP asked for, but this is my setup as well. Simple text is stored in Joplin, Nextcloud is for everything else.