Blame Apple because they constantly tout the iPhone as being "privacy respecting" and "what happens on your iPhone stays on your iPhone"[0], while they
A. Apple doesn't default to "limit tracking", or at least make "limit tracking" an option on setup/iOS upgrade
B. Apple doesn't penalize developers for using Facebook's SDK with auto data collection (ie. punishment by having text like "sends data to: facebook, google, hotjar" on an app's install page)
C. Apple doesn't do any software stuff to limit and track the trackers. Having a counter for # of total days a domain name was contacted would be an eye-opener for many, and being able to toggle a "block" on the domain would be a big step forward.
Facebook meets the standard for being included in apps (respects the user resetting the usage ID), but that standard isn't the standard privacy-conscious users want. Apple can do better, but whether it be industry pressure or monetary pressure [google paying to be the default search engine], they don't actually put privacy first.
0: https://www.businessinsider.com/apples-ces-ad-las-vegas-misl...