George Bernard Shaw famously said "Those who can, do; those who can't, teach." Flippant statement, but with perhaps more than an ounce of truth to it.
In the data security world, the corresponding statement would be "Those who can, secure; those who can't alert."
The business of securing data in the mobile cloud has many an entrant. But most entrants can do little to secure the data and are content in providing alerts. In order to secure the data, you must first be in the path of access to the data. That is very hard to do.
Getting in between the cloud application and the mobile user, anywhere, on any device is a daunting technology challenge. To date, Bitglass is the only vendor that has been able to achieve this in reality, with real users in production use every day. See my prior post on this from the point of view of a systems integrator.
Vendors who are unable to surmount the technology challenge to get between the user and the cloud app have simply given up and taken refuge behind cloud app APIs. Grant them API access and each morning you will get a digest of sensitive data that has leaked out the day prior. Why bother?