I don't think "relay" is the best name for what we have on Nostr, but for what they have there it is a much worse name. 

 I am questioning whenever they know what relay actually means and how do they actually worked. 

 Lol 

 Imitation is the sincerest form of flattery that mediocrity can pay to greatness. 

 NOSTR 🤙⚡️🫡 

 Sounds familiar 🤔
Lol 

 they say "Anyone can host a Relay" , what is the difference with the nostr relays?   

 The difference is in the way most people build nostr apps.

Most nostr apps use the nostr relays both for data storage and as actual relays (to relay data between the entities storing the data and the client apps).

In Bluesky there is a clear distinction between relays and PDSes, both of which you can self-host, which makes the model much easier to understand, which in my opinion is a huge plus.

 

 Technically you could have PDSes on the NOSTR as well, something like relays that interact with other relays only