Is spambots downloading apps from App Store or Google Play an issue?

Hi, 

I have a business app which lists a number of records with phones, emails etc. One of the clients mentioned they are worried about spambots harvesting personal info off apps downloaded from the App Store or Google Play. 

I am of course aware of spambots harvesting information from web pages but I never heard about app downloading spambots. Then again, I guess anything is possible. 

Has anyone here seen or heard more on this topic? Should I be hiding plain text email data in my app? 

Thank you very much for your input.