Oh man, I feel like eviltoast.org is on the expensive side of things now. There's less than 20 mau, but I pay close to $400/mo. Not including object storage or hardware running at home.
Realistically this is hosted on hardware I was already renting for other reasons, so actual cost is zero for lemmy itself. I could probably migrate to a small vm for $20/mo and only lose redundancy.
It's infra that was already hosting other things. Lemmy got added to it because there were spare resources in the cluster.