"The likelihood of customers paying for an application is very low in the Android market, especially compared to the iOS market," Sigurdson said.
Android's method for granting permissions to apps to collect data from a phone also contributes to aggressive harvesting of information by adware, he added.
Android shows you a list of permissions that an app wants, but it's an all-or-nothing proposition, forcing a user to read a laundry list of permissions.
"Most of the time a user will download the application, ignore the list of permissions and just click OK," Sigurdson said.
Security firms have been warning Android users for some time about the dangers posed to privacy by adware and malware. Some of those warnings have been dismissed by critics who say the firms are out to sell software by hyping the dangers involved.
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