The tiles are pretty big (tiles in Manhattan are 2-15MB), but they compress well (900KB-5MB). The output pmtiles file is 530GB. I built the profile here if you're interested in how it works: https://github.com/onthegomap/planetiler/compare/main...iandees:planetiler:lowzoom-qa-tiles
One interesting thing that's hard to see with Matt's tool is that the tiles all have information about any large polygons they sit in. For example, you could use this to build a reverse geocoder by mapping the point you're looking for to a tile, fetching the tile, and looking at what polygons your point sits in. Neat!