Hello fellow iOS developer. I have two apps on the Apple store. I never used any external SDK/libraries, only the built-in Xcode ones. I preferred to spent a bit more time in writing/testing but I would never accept that FB and other scum (privacy standpoint) track children (I wrote the apps for my nephews and nieces and I put them in the Apple store just for them)(I don't advertise them at all and I won't do so here either).
Regarding the issue that started this Zoom-FB dialogue I have commented a dozen (or more) times on the necessity to have a firewalled phone that a user (unfortunately the user needs to have basic knowledge of firewall admin) can decide what to allow and what to block. Your point on who audits is valid (I am a CISA and CISM of many years), and, well, nobody does. Each user will have to do his/her own work/effort to keep their family clear of these scum.
Regarding the issue that started this Zoom-FB dialogue I have commented a dozen (or more) times on the necessity to have a firewalled phone that a user (unfortunately the user needs to have basic knowledge of firewall admin) can decide what to allow and what to block. Your point on who audits is valid (I am a CISA and CISM of many years), and, well, nobody does. Each user will have to do his/her own work/effort to keep their family clear of these scum.