You'd think so, but no!

They only do that if you set up that specific email on your account. Not if its 'any email other than the noreply one'.

> When you push to GitHub, we’ll check the most recent commit. If the author email on that commit is a private email on your GitHub account, we will block the push and warn you about exposing your private email.

Perhaps my usecase is niche, but I sometimes work with other git servers from the same machine with different emails and I don't want to set up all those on GH. Global settings don't help here, per-repo settings help but this doesn't come along when you clone a new one.