The argument that it isn’t decentralized doesn’t make sense to me as a user. The client/relay design of Nostr makes my user data redundant, verifiable, and ownable.

Redundant: once signed, my events can be broadcast to as many relays as I want, and they don’t even have to be broadcast by me. Anyone can broadcast them, and I can broadcast anyone else’s.

Verifiable: No matter where my events are broadcast/stored, they are verifiable by your client by my public key, and vice versa.

Ownable: I can use any combination of public, private, shared or personally owned relays, and all my data is redundant across them all. I can locally backup my entire event history and rebroadcast it any time I want.

Who will run the relays? Whoever can, and if centralized relays become more problematic then the data can be easily broadcast to additional relays.