It's not "other stuff", it's stuff other than Nostr.
It is as much Nostr as Google Drive is.
Nostr is a protocol. Nostr.build is an image host like many, it just happens to have "Nostr" in the name.
> You do realise the relays (the R in nostr) are just servers, right?
They are Nostr servers.
Not all servers are Nostr servers. Only those that operate through the Nostr protocol are.
If one can access the servers with a nostr keypair, they are utilizing the nostr protocol.
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Not necessarily.
Nostr keys can be used generally for asymmetric encryption and related task.
The Nostr protocol is a client/server communication protocol, as well as a data format.
Regardless, images aren't being hosted "on Nostr", in any sense, when nostr.build is used.
