This is a really interesting point regarding road Vs actual distances, and large areas that are thinly populated being considered local. Australia certainly comes to mind. I suppose the right thing to do about the latter would be to give both users and owners control over search and area sizes.
The quiet feed point is my biggest concern to be honest. It worked out for Lemmy and Mastodon, but it took revolts from their privately owned counterparts to get them to the place they are now.
fear that every country might have it's own unique problems, but I'll look into postcodes, thanks.