Everyone that argues against the rule that says you can't advertise in your apps ways to bypass the App Store for payment are basically arguing that they should be able to free ride on the platform, something discussed in this study.
>In addition, for their business model to be successful, digital marketplaces often have to rely on rules that prevent customers from free riding on their services. Free riding involves buyers and/or sellers avoiding fees after the platform has helped connect them, which means that the platform is not compensated for the successful match and the use of the platform’s technology, tools, and services to facilitate and promote valuable transactions between buyers and sellers. A review of the policies and rules of large app stores and online marketplaces that distribute physical goods and services — marketplaces for which the risk for free riding is particularly high — shows that digital marketplaces routinely forbid behaviors aimed at avoiding fees.
>In addition to the commission on paid apps and in-app purchases of digital content, services, and subscriptions, Apple imposes guidelines that govern the use of the App Store. Among those policies are rules about in-app purchases to prevent users and developers from free riding on Apple’s App Store services and investments. Apps cannot explicitly steer app users away from in-app purchases — for example, by providing external links that bypass the App Store.