Yes, it is recommended to use a completely random email by default, and only use your custom domain as a fallback when you can't use the random one (e.g. when y

Yes, it is recommended to use a completely random email by default, and only use your custom domain as a fallback when you can't use the random one (e.g. when you have to give up your email somewhere in-person). We're looking into ways to make that clearer, because people's intuition tells them to use their custom subdomains by default.