[londons_explore]

If the domain has ever been used for anything, there are serious security reasons to never reuse it.

For example, imagine your recovery email address for something important is [e-mail]. If 'gb' is ever reassigned to someone else, they can now get access to anything ever registered at a gb address.

This is the reason things like gmail accounts are never recycled to another user. Early services like hotmail would recycle accounts, but it has since become an 'obviously bad idea'.

[bastawhiz]

The post does say that only one domain has ever been registered and it's been defunct for decades. The risk is probably zero.