From the Openletter Matrix room:

Hi all! Thanks for your support. We're beginning to spin up website, CDN, and map generation resources. If you or someone you know would like to donate or has affordable bandwidth or compute, please let us know! Currently map generation takes about 6 days on a 16-core 96gb ram 4tb HDD machine, which would be about $89 per run on AWS. We'll be looking at efficiency improvements as well.

Edit: context: https://sopuli.xyz/post/26045384