No, but even read only access to private repos is a problem. A lot of that code belongs to my employer and I can't in good conscience grant access to it even if I want to.

I'm not sure why having an empty account is something you care to filter on. If someone really wants to pretend to be a dev, forcing them to click "Create new repo" before they sign up isn't going to provide much of a barrier. You're already basically taking them at their word so I'd recommend just dropping the requirement.