TLDR: "Cloud" is now considered a non-engineering, non-technical term in common usage. It once "was" a credible engineering term, meaning "out of scope", but no longer is, due to populous/business pollution of terminology.
View Image .... the most simple textbook reproduction in SE101 of the cloud symbol.
Any attempt to describe the contents of the cloud are ... contrary to the symbol. "Black box, in-out, don't care, don't need to care" = the cloud symbol
The trouble is. A picture of a cloud on a diagram is overly romantic and overly emotionally provoking than we would hope.
It became a viral "business term". "The more we can move into this "cloud" thing the better!".
We made our own bed I suppose. "look what we can do!", "so you can do X?", "No.", "Okay great we can sell X tomorrow and you will figure it out okay?", "wait what?", "youll be fine itll happen if we believe"
If you are not catching on, the catch is... someone still needs to develop what happens in the cloud. The diagram is meant to show the scope of the problem, not reality. Any and all relationships between "the cloud" and it's many marketing BS are suspect these days as "the mass" understanding of the terms is now in common use in a flawed way. Not like that is uncommon.
Other examples of stolen terms.
Hacker: Someone who "hacks away" like a lumberjack never quitting until the wood is just right.
Media: So like a cracker, criminal type who "hacks" banks.
Engineers: No. Not like that.
...
/get off my f'ing lawn.