Relative to other Fediverse software it is expensive due to how much community federation and vote traffic drives up compute and storage needs.
The exact costs really depend on your location and if you are renting a server or run it on your own hardware. But I doubt you can run a well federated Lemmy instance for much less than 30€/month. Of course it initially runs on a much cheaper VPS, but once you start subscribing to remote communities it quickly needs more power and storage.
Relative to other Fediverse software it is expensive due to how much community federation and vote traffic drives up compute and storage needs.
The exact costs really depend on your location and if you are renting a server or run it on your own hardware. But I doubt you can run a well federated Lemmy instance for much less than 30€/month. Of course it initially runs on a much cheaper VPS, but once you start subscribing to remote communities it quickly needs more power and storage.