And even if you disable it, it can still block you.
I didn't try to reset my phone completely, but I have to Force Stop the Google Play Store and empty cache/user's data to install any apk
English may not be my mother tongue but I can logically follow an argument.
Your friend' daughter was not obligated to sign such contract and GDPR reinforce previous laws protecting her image ;)
What ? It's the opposite, it allow you to access and delete the data, even if you gave consent one time.
And your image concern a lot of other old laws, even if you sell it you can get it back later.