Description
Cardinal is writing files in $HOME/Documents/ like configuration files and random stuff, probably a windows-ism. This is the only application that does that on my system.
I personally sync my Document folder with other hosts so it becomes annoying to clean them up when unwanted files get copied everywhere unnoticed. I had to create AppArmor profiles to avoid this.
So the suggestion is to follow the XDG Base Directory Specification, like storing configuration files generally into $HOME/.config/Cardinal/, etc…