I’ve said before, a privacy respecting phone is not just for your protection, it’s also about protecting your loved ones, as they are often within (shared location, contact info, personal details etc.) that same data - or, as @Kyle_Rankin wrote, may use the same devices.
But for some researched comparison (“auto-mated analysis of 5,855 of the most popular free [Android] children’s apps”, 2018): just in this games section specifically aimed at children (where you’d think there would be some limits), over half of the games violate - sometimes heavily - data collection restrictions. And it’s likely worse for adults, in other/“normal” apps. And to give some additional background of the ecosystem, most games don’t program this functionality themselves but publish their games on top of some ready platform that provides the gamehouse the few metrics they need while the platform siphons data to themselves and their third parties one the side.
The study here and a couple of articles that elaborate it here and here.