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The bit about the dangling sub-domains and the servers in limbo is a very common problem, which has been on the radar for a long time.
Specifically, the cloud services do some DNS re-direction. The servers, or services, get an internal name and the cloud brokers on the perimeter use a LUT to see where the external domain names should be going (and if they are load balanced, it sends them to the node that is closest or has the least load).
If somebody forgets to decommission the external DNS name and its entry in the look up table, somebody else can come along and commission a new VM in the cloud provider’s infrastructure that uses the same internal name as the previously decommissioned server. There have been a few cases of this over the years, so I was surprised that Steve didn’t know this.
I was also surprised that he didn’t know the term limbo, other than as a game. Given it is a Christian religious term, specifically catholic, and is often used in books, TV and films. News stories also often use the term - “neither side could come to an agreement, leaving the process in limbo”.
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