This is the right move. 10 years ago, us-east-1 was on the order of 10x bigger than the next largest region. This got a little better now, but any scaling issues still tend to happen in us-east-1.

The AWS has been steering people to us-east-2 for a while. For example, traffic between us-east-1 and us-east-2 has the same cost as inter-AZ traffic within the us-east-1.