I’ve looked at containers as possible housing “units”.
For a shed, for a utility room, for good security, they are pretty good. Gotta be very careful of roof corrosion.
But everything I have looked at, to run utilities, to make smooth residential-style walls, to place windows, seems like more work than stick-built. Under current hyperinflation lumber pricing, that may no longer be so.
But they certainly seem like a hell of a lot of fuss to wire and plumb and finish out. Yes, I have seen some interesting structures and small dwellings out in the boonies, and yes, there is an attraction in being able to get instant enclosure to a remote spot.
Grounding not an issue... ;)