I wouldn't worry so much. What can you infer by that? It's completely normal that people working on database engines don't know that much about operational stuff like what network connections to listen to. The product I used to work on, for example, had this exact same misfeature. The real motivation for fixing it was that developer machines would be listening to the outside world, whenever we or our users ran tests and such. The idea that people would run it this way in production was completely foreign to me, personally.