Security: ask whether to auto-connect to the chosen public/captive wifi network?
If I'm not mistaken, WiFi networks can be spoofed a bit too easily, and known hotel/restaurants/universities/airports wifi names could easily be replicated outside of those premises to lure a device into connecting to them automatically. I sometimes go back to disable "auto-connect" on previously connected WiFi networks using GNOME Control Center, but that's tedious and prone to me forgetting, and also it requires a paranoid technical user to even think about this (after all, the feature is buried deep within the wifi network's properties within GNOME Control Center, and in practice nobody goes into GNOME Control Center as a leisure activity).
As part of the ideology of https://wiki.gnome.org/SafetyTeam, I'm thinking that GNOME (Shell + Control Center) should help users make safer choices from an infosec standpoint by not only prompting about whether a network is metered (issue #2199) but also whether that network should auto-connect (maybe with some "