Re: And another thing
You're right, it's very much not smart. But it ain't Microsoft that were being dumb.
He could have gone into File Explorer, and copied the files in any manner he fancied from there, just as if they were on the local disk. "File Explorer", you see? The clue's in the name?
The web interface into OneDrive used to be pretty clunky, simply because it's just not needed. It's a lot better now, but still completely unnecessary in most cases - I use it occasionally to archive project stuff from customer's machines that can't be logged into my Microsoft account directly.