Nostr fixes this 
Discussion
But that's basically what Amber does, too 🤷♂️
Yeah it's similar but nostr doesn't gossip a whole bunch of keys so it's usable, no sync issues.
Also I am bullish on frost signing which further mititgates the key centralization while offering a path for good ux.
Nostr hasta ahora soluciona casi todo 💪🫡