This looks like a cross between Mailinator and Fastmail. Great idea, but why is 1password involved? I don't want to sign up with yet another damn service, and

This looks like a cross between Mailinator and Fastmail. Great idea, but why is 1password involved? I don't want to sign up with yet another damn service, and I'm happy using my browser password store (or email client API key) to access fastmail without needing 1password. I don't understand why services like 1password even exist. They just increase your computer's attack surface. Am I missing something?