Marco Arment Quotes
Apple already had everyone's billing information from iTunes... you could buy things just by typing in your password... That, for the first time, brought very, very easy payment to the modern software world. That, more than anything, is why there is a business for paid apps.
Citations
Arment, Marco. "The App Store Economy." Marco.org, 2013.
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Marco Arment is an American iOS developer and web developer, podcaster, technology writer and former magazine editor. As a developer, he is best known for being chief technology officer for Tumblr and creating Instapaper and Overcast.