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With a factory reset the phones encryption keys will be destroyed and nothing should be retrievable from that device. Even if the data isn’t overwritten, without the encryption key no one could read it.
At least that’s my understanding of the modern safety- and encryption features of recent phone models/mobile OS’s.
The worst part: Apple’s iCloud is end-to-end encrypted and even Apple can’t see the users files, at least that is what they say.
If what the dude on Reddit states is true, then this is bad, really really bad! 😮
To give you a little insight, it’s totally normal over here in Germany, since decades: (Allgemeine) Schulpflicht (English: (General) Compulsory Schooling)
The idea is, that every child has a right to education. Forcing their parents to let them attend school.
In rare cases police picks up the pupils or parents go to jail.
Still, it’s subject to ongoing discussion.