by Ken Task.
From:
https://askubuntu.com/questions/990013/system-mounts-dev-loop0-on-snap-core-3604-and-its-100-full-where-is-it-comi
"That is normal. /dev/loopX are virtual devices to mount image files. And they are -read only- so do not get larger or smaller than they are when created.
Those mount points are connected to the snapd service. You will see extra loop devices added for every software you install using "snap"."
So .... ??????? dunno!!!
'SoS', Ken