Azure does appear to be quite wide-spread, I think microsoft has always been a very glom-y company with a very high network effect from using multiple of their products in tandem. The healthcare market isn't nearly as startup friendly as others and a lot of the movers and shakers directing company direction are likely to be more familiar with the business sides of things than pure dev folks - I think that naturally slides into an MSFT preference since those folks will be using all flavours of office and at least some portion of dev talent will need to be MSFT folks who can work Access/TSQL/VB magic and make the spreadsheets work.
Lastly, all three of AWS, Azure and GCS do try and make a big deal of their HIPAA compatible instances, but whatever the compliance officer at a company is used to is what will get by the easiest - honestly anyone who has a compliance officer that is happy to accept a non-on-premises solution should count themselves as lucky.
All that said - I'd be amazed if MSFT hasn't invested heavily into advertising to cement this decision, but I'd also be surprised if AWS hasn't been trying to dump even more money in there - google just seems a bit clueless when it comes to the convention game and these sort of closed circles where everyone plays golf on tuesdays.
Lastly, all three of AWS, Azure and GCS do try and make a big deal of their HIPAA compatible instances, but whatever the compliance officer at a company is used to is what will get by the easiest - honestly anyone who has a compliance officer that is happy to accept a non-on-premises solution should count themselves as lucky.
All that said - I'd be amazed if MSFT hasn't invested heavily into advertising to cement this decision, but I'd also be surprised if AWS hasn't been trying to dump even more money in there - google just seems a bit clueless when it comes to the convention game and these sort of closed circles where everyone plays golf on tuesdays.