Restoring items is very reqarding for sure, I love making things useful again.
Working with wood, metal, glass (my trade).
The Mavic Mini might be of limited use, the cameras on these things don't show up a lot of detail until very close, especially if using a phone screen.
Even an ipad type device it's hard sometimes to see people from a few hundered feet up.
Maybe a
M2Z with the zoom would manage to see things better.
But you will need a reasonable flying height (needed especially for the mini wifi), or you will lose connection very fast if not in LOS, coupled with urban wifi interfereance.
You'd be better scouting from a height, then walking the alleys etc when you spot a pile of 'rubbish'.
If you did fly low enough to see 'stuff' on the ground, you will most likely upset someone in the local homes !!
And probably with good reason as people won't be aware of your good intentions.