That's mostly because I decided to use maps from the daylight maps distribution. The current tiles were actually built last night. I think it probably makes sense to track planet.osm.pbf directly though because I want to create a virtuous cycle where users feel that contributing to OSM has a real tangible payoff.

The main issue with updating regularly is going to be that long-term I can't really afford a beefy enough machine that has a fast uplink to Cloudflare where my artifacts are hosted. Getting all of the planet-sized artifacts uploaded even just this one time was a huge pain. I ended up having to generate them on my desktop, ferry the data to a friend's house on a laptop via motorcycle and upload them from there. This is one of the things that I want to help remedy if I get enough support via Liberapay or GH Sponsors.