The content should be the context, primary.

But I agree that it can be improved, at least to trigger some curiosity in the user.

Maybe the top-left "What is Nostr" is too conceptually distant for newcomers, we can add something like

"Do you know that what you are reading is on Nostr, a decentralized network? Read more" 

that when clicked briefly explain the background context (this stuff is a note on Nostr, that can be viewed choosing from different apps, blabla, read more about the nostr protocol here).
 

 Is tooltips not possible in nostr, it’s inaccessible in mobile, maybe there needs to be protocol level state machines