1-4. Sounds like private profiles, which a NIP is being worked on, I remember seeing Viktor from Amethyst mention it.

5. Pretty sure I heard something like that on Nostr, using a modified version of IPFS I think.

6. That can be done, by connecting only to relays that would follow those rules and have that option, though I'm not sure there's a provable way to know they actually deleted it.

7. The Monero community could build a client with that, nothing is stopping them. Though I'm not sure how/if Monero can handle micro-payments like LN. Calle is working on Fedimint Lightning enabled zaps for Nostr, which is a possible more private alternative with obviously some trade offs in federated custody - which is already better imo than fully custodial Lightning like WoS to handle stupid-tiny amounts of Satoshis.

That's the beauty of Nostr, anyone can create whatever they wish however they want to on top of it 🤙💜