Comment by esdf

Hosting large datasets can be expensive but the hosting for the danbooru datasets was not. It's "only" a few terabytes in size. A previous release was 3.4TB, so the latest is probably some hundreds of GB, to a TB~, in size larger. The download was hosted on a hetzner IP, which is a provider known for cheap servers. You can pay them $50/m for a server with "unmetered" 1gigabit up/down network + 16TB of disks. $600 a year would not be difficult.