> I'm really curious how this person got codeberg pages working, I still haven't managed to get a codeberg page deployed. I thought it required a 3rd party server, like their actions seem to.

Hi, author here. It doesn't need a 3rd party server - it's all hosted in Codeberg Git repos. Here's a guide - https://codeberg.page/

> What's unsustainable about Matrix? I've really enjoyed running our community on Matrix.

Many of us in the Delhi OpenStreetMap community are associated with projects like the Free Software Community of India, and run public instances of federated services, including Matrix and XMPP.

It has been our experience that XMPP has a dramatically lower server resource footprint than Matrix. We've actually had to close down a public Matrix service because it was economically unsustainable in this sense.