nostr:nprofile1qqsvnx99ww0sfall7gpv2jtz4ftc9v6wevgdd7g4hh7awkpfvwlezugpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhs38wxc9 - 100% private by design, (quantum-resistent end to end encryption, with perfect forward secrecy, repudiation and break-in recovery). You have no fixed IDs on there, and all data are local. On a Nostr based solution, like nostr:nprofile1qqs9ajjs5p904ml92evlkayppdpx2n3zdrq6ejnw2wqphxrzmd62swspzemhxue69uhhyetvv9ujuvrcvd5xzapwvdhk6qgdwaehxw309aukzcn49ekk2qghwaehxw309aex2mrp0yh8x6tpd4ehgu3wvdhk6ynf30t you can be exposed if someone know your Nostr nsec, can be a really big problem. And as you use your nostr profile across different clients, people can sent a normal Nostr DM, without the NIP-17 that hides some metadata from relays.