It appears that Sync sorts by numbers > Capital Case > lower case, as noted by !RimWorldPorn being sorted above !android rather than with !rimworld in the subscriptions list as I would have expected.
It's a small thing but just seemed odd. Is this intended?
If you look up an ascii table you will see numbers come before upper case, which in turn comes before lower case. The programmers probably just did a simple compare instead of ignoring the case during the process (or similar).