I also run a PiHole, and to my displeasure, I've found both these apps use Google Analytics. PBS Kids Video goes a few steps further and uses Google AdWords as well as ScorecardResearch analytics. These publicly funded apps are siphoning data about me and my little one off to 3rd parties. The 3rd paries might not be able to use that data for targeted advertising within the app, but make no mistake that the data is still used to 'enrich' my shadow profiles. I am very excited about these changes from Apple and I hope that they are able to enforce them. I've written both of the apps support emails in the past about the analytics and never received a response.
I've also heard of a popular BBC kids app called CBeebies. Last time I ran it on my iPhone, it reached out to Facebook, Localytics, Branch.io, Google Analytics, app-measurement.com, and onesignal.com