i just tested it today, and have this small contribution to add:
when there is a default profile cover uploaded into the system which applies to every user,
your plugin prompted me to change that upon logging into my test profile.
but.. I do not want this, I only want it to make someone upload a profile photo, if they only have the color and the letter in the circle.
If there is already a system wide profile cover, your plugin should respect this setting, and not go straight to that. :)
best,
~Omar