the hosting cost is taken over by the blossom servers. at the moment the service is free, but i don't exclude at some stage they will start requesting sats or cashu tokens for the hosting.

You have a full list of active https://blossomservers.com/ here, you can see some are already offering it as service.

Something similar happened with nostr relays

supratic

nostr

nsite - Why Decentralized Static Website Hosting on Nostr

Looks interesting... I'd like to bookmark and add it to the list of things I need to test out.

There must be some kind of hosting costs?