This is a head-in-the-sand move by US companies (not just Cerner and Epic, but the hospital system CIOs). If they really think Google is going after healthcare data, they should keep in mind Google is already working with NHS and has a little thing called the Billion Users project focused on India. The British and Indian populations have the same health problems Americans do. Proportions might change, but the content is qualitatively the same.

Also, I wonder if AWS is pushing their heads into the sand. Particularly now that Cerner committed to AWS but DoD gave Jedi to Azure (Defense Health and VA are migrating their medical records to Cerner). AWS may be pressuring a customer (Epic) to squeeze their customers. Which absolutely sounds like something I'd expect from Amazon.