For my niche use case, I'd love to see this somewhere in the middle of the US so I can have a single instance with similar ping to both coasts.
That is why our primary location is in Denver. No earthquakes, no terrorism, no floods.
rsync.net customers all over California happily keep their backups in boring old Denver ...
(with a one hop route into the he.net core in Fremont ...)
https://noc.net.internet2.edu/
Which would you choose?
https://aws.amazon.com/about-aws/global-infrastructure/
Scroll down to AWS Global Infrastructure Map