> ???? I have no idea where these came from, but my guess is that they are migrants from the wild west Windows-land, where I assume the shell won't try to expand ? into anything. Using these options will cause problems for anyone using common shells like bash, zsh, others. Don't do it.

They come from getopt() returning '?' for any unknown option, which usually ends up being the default case in your switch, but could be '?' to be explicit.