Whenever they start using it just ask them what real guarantees there are that anything using cloud storage or sent to a cloud app for processing won't be data mined.
Or, for that matter, come back with a virus.
Or even come back at all.
You can conceivably store something on a cloud server, have the business close down, and POOF, data's gone.
I'm sure you'd get warnings and such through email/text/calls, but if you failed to heed them in time?