Hi everyone, I addressed this point here: https://github.com/bitcoinwarrior1/CitySats/issues/23. Remember that it's possible to create a burner Reddit account (which doesn't ask for an email address) and use that to sign in. This is arguably better than email/password auth as you keep your email address secret, and creating a burner Reddit account is quick and easy. I will probably add email/password login in the future; it's just a huge pain for the MVP.

It's not my project, I'm not affiliated with it in any way, just saw it on Reddit and reposted here, so can't answer questions about signups or anything else.