Apple's iOS 14.5 update (released on May 3rd 2021) which introduced App Tracking Transparency also introduced a bug which affected some apps, including SPIN Safe Browser. The good news is Apple issued an update which corrects this behavior. Please confirm that your iPads are updated to 14.5.1 (released on same day) and higher.
SPIN Safe Browser should perfect as expected once you have this update installed.
Our stance on app tracking and user privacy
With our 1.0.3 update, SPIN Safe Browser+AppConfig no longer includes third party analytics libraries. The only data we are able to receive from installs of our browser are what Apple allows when the user consents to sharing information with developers during their iOS device's initial setup. Our in-app web filtering service does share the visited URL (domain) to confirm if a website should be blocked or not but this action does not record or save any personal identifiable data with our service.