https://piefed.social/f/lemmycategories
Here is the outcome from the brief chat I had here.
This is not finished - not in categories, not in organisation, not in communities, but I'm getting exhausted currently. Many communities on here are old, dead, tired. Some are new. Many categories are barren, some are overfilled and need more segmentation. I'm just sharing what I've built as I think this could be very helpful to community advertisement and exploration.
I'd like anyone who runs or knows of communities to let me know here, so I can add them.
Well until some collaborative function arrives, I'll scan communities posted on advertising communities and invite people to communicate to me their community and its categories. Taking advice for new sub-feeds and reorganisation in here, or indeed, on a hypothetical matrix room.