Hello both! We chose which categories to make public and which to keep private when we first launched this forum back in 2018 after this discussion on the subject: Which discussion categories should be public?
tl;dr: the forum emerged from a private Google Group for our London community. The general feeling at the time was that we’d rather keep most conversations visible only to logged-in users, while opening up others.
It’s potentially something we could revisit, though would need a wider discussion 