This is more about education and changing a default.
The only issue here is not realizing the email field in the git config doesn't need to be your personal one or even real. And I agree more people should know this, but this is not something github or git needs to fix in any way.
If you think people should only use an email address that they want to be contacted with, that is where I am saying the issue lies. People signup to Github, commit some code without knowing Github is giving their email out to the world. You are arguing that is by design, but I am saying most people don't understand it works that way. It's an education thing or change of defaults.
Anyway, if you tick the keep my address private box on https://github.com/settings/emails, the email field on your profile won't show.
I don't think this is a big issue.
