I think this study is quite good but it does come with one important caveat: From page 5, "This is before the introduction of Apple's new opt-in mechanism for tracking in 2021. Our dataset therefore reflects privacy in the app ecosystem shortly before this policy change." Personally, I would prefer to see the difference between apps monetized by customers paying directly and apps monetized by advertising. I take for…
0: https://hugotunius.se/2021/01/03/an-analysis-of-privacy-on-t...