None of the software that I write gathers any customer information.
My eCommerce partners, FastSpring and the Apple App Store do gather customer information in the course of implementing sales transactions.
I do not share any customer information. I do not authorize my eCommerce partners to share any information about my customers.
Other than keeping track of sales, I do not use customer information at all..
I will not contact a customer in any way unless he or she has personally sent me an email (elliotl@torpor.com).
End of story.