Nostr is definitely a better solution, but it's still a closed ecosystem.

- Nostr locks you to one specific private key.

- Nostr locks you to one specific messaging protocol.

- All native Nostr apps support only one network.

- Most Nostr users use native mobile apps, which don't provide much freedom to e.g. sign arbitrary messages like web3 browser extensions.

- Nostr's most popular npm package 'nostr-tools' doesn't even expose a function to sign arbitrary messages, which is the most basic expectation of pretty much any other web3 library.

- The most popular Nostr app, Damus, is literally an iOS app.

- The Nostr network is pretty centralized.

AI agents and their devs will eventually choose Spasm since it's the only truly open ecosystem due to its unique agnostic architecture.