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That’s not true. There are methods for proving control of a key, both in the protocol and outside.

- Sharing keys in person

- Sharing keys via other channels like Twitter

- Via DNS using NIP-05

> A tweet is not a direct message, it's a broadcast message.

> Without a centralized 3rd party mapping names to public keys

Sharing in person doesn't work for broadcasting

Other channels require falling back to some non-decentralized system.

Again, it's the oracle problem. You can't say it's not true, that's like saying "1+1=2" is not true.