A multitude of corporate IT/Cyber departments attempt to replicate their network architecture in the cloud. Unfortunately, that is not the way to go regarding cloud transformation. When organizations use the cloud it makes the most sense to leverage native solutions as much as possible.
While trusting cloud service providers (CSP) completely is not prudent, many CSPs have matured their services, especially security-centric solutions. With that said, if there are any doubts/concerns, the most pragmatic choice is to leverage enterprise data protection solutions before data is migrated to the cloud. Said solution could negate concerns about a CSP's data handling procedures.