I helped someone with his first wallet and he threw away his backup phrase because he said he already registered his email, and he thought he could recover the money with it.
Not sure why the email is asked in the latest versions, but asking for it not only causes fear to new users about their privacy, but also some of them get confused about Copay being a Bitcoin bank or hosted "wallet" because of it.
Sorry if this is being talked in another issue, I searched for it but didn't find it.