Ex-Amazonian here. I worked on the EC2 API for just over a year, and this could simply be a legacy thing. See https://en.wikipedia.org/wiki/Timeline_of_Amazon_W

Ex-Amazonian here. I worked on the EC2 API for just over a year, and this could simply be a legacy thing. See https://en.wikipedia.org/wiki/Timeline_of_Amazon_Web_Services https://en.wikipedia.org/wiki/Timeline_of_Amazon_Web_Service.... us-east-1 is the oldest region and predates Route 53. Not adding extra DNS providers to the older regions is probably an oversight. (The EC2 API team requests load balancers from a separate load balancer team. The load balancer team probably didn't exist as a separate team when some of these regions were created.)