| Summary: | In this article we address the question ‘what is tracking in the mobile ecosystem’ through a comprehensive overview of the Software Development Kit (SDK). Our research reveals a complex infrastructural role for these technical objects connecting end-user data with app developers, third parties and dominant advertising platforms like Google and Facebook. We present an innovative theoretical framework which we call a data monadology to foreground this interrelationship, predicated on an economic model that exchanges personal data for the infrastructural services used to build applications. Our main contribution is an SDK taxonomy, which renders them more transparent and observable. We categorise SDK services into three main categories: (i) Programmatic AdTech for monetisation; (ii) App Development, for building, maintaining and offering additional artificial intelligence features and (iii) App Extensions which more visibly embed third parties into apps like maps, wallets or other payment services. A major finding of our analysis is the special category of the Super SDK, reserved for platforms like Google and Facebook. Not only do they offer a vast array of services across all three categories, making them indispensable to developers, they are super conduits for personal data and the primary technical means for the expansion of platform monopolisation across the mobile ecosystem.
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