In Italy we're already in quite similarly bad situation, following is a list of third-party "services" used inside PosteID https://play.google.com/store/apps/details?id=posteitaliane...., one of the most used apps for gov. authentication:

Libraries: Adobe Experience Cloud, Google AdMob, Google CrashLytics and Google Firebase Analytics

Domains catched so far: ajax.googleapis.com android.googleapis.com auditrecording-pa.googleapis.com clientservice.googleapis.com connectivitycheck.gstatic.com crashlyticsreports-pa.googleapis.com deviceintegritytokens-pa.googleapis.com doc-0k-ac-docs.googleusercontent.com firebaseinstallations.googleapis.com lh3.googleusercontent.com www.googleapis.com assets.adobedtm.com oms.dowjoneson.com 2.bp.blogpost.com firebase-settings.crashlytics.com s.webtrends.com statse.webtrendslive.com

To sum it up: googleapis, gstatic, googleusercontent, adobedtm!, dowjoneson?, blogpost!, crashlytics, webtrends, webtrendslive

Plus, the system is based on providers, so you have to go through many burocratic steps to get recognized and then you pay-per-user/year that can go up to 7 Euro/user