https://app.urlgeni.us/blog/new-research-across-200-ios-apps...
Just a few of the highlights:
Magazine apps had the highest number of total network contacts (28), and the highest percentage of third party domain contacts (93%)
Social apps, followed by Games apps, made the fewest number of network contacts, 6 and 7 respectively.
Apps making the most number network contacts included iHeartRadio (56), Wall Street Journal (48), ESPN (42), Popeyes (42), and WattPad (36)