They are referring to this https://aws.amazon.com/govcloud-us/?whats-new-ess.sort-by=it...
So not the greatest analogy. But still I think most doctors, lawyers etc should be okay with their own cluster running in the cloud.
HIPAA data can definitely be stored in the cloud given the right setup. I’ve worked for companies that have done so (the audit is a bit of a pain.)
Absolutely. Virtually every instance of Epic EHR is hosted, for example.
I imagine lawyers knowing about where document data is stored as a bit like software developers being sufficiently aware of licensing. There's plenty who are paying attention, but there's also plenty who are simply unaware.