There's no great white-hat hacking or technical knowledge at play here. The kid was observant, and realized it wasn't right. (Not to denigrate any technical expertise or talent that he does have - I have no knowledge.)
He did more than just accidentally called himself over group Facetime. He followed-through and persisted when adults basically told him "go away, kid, ya bother me!"
That persistence is a great trait, no matter WHAT profession he chooses.
You must have inside information that hasn't been made public, because every article I've read states that his mother was the one who contacted Apple and persisted. In fact, then kid himself states his mother was the one who made the contact and continued to pester Apple.
“You can swipe up and add another person, so I added another friend of mine, Diego, to see if he also wanted to play,” he said. “But as soon as I added Diego, it forced Nathan to respond.”
...
His mother, Michele Thompson, said she started trying to reach Apple the next day.
...
“Every day he would ask me, ‘Did we hear from Apple yet?’ she said.
...
“My mom contacted them almost every single day through email, calling, faxing.” Of the fax, he jokes, “I’m not even sure what that is. It’s probably older than I am.”
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Getting an official credit like this is huge. If this young man decides to go into security he could get into some very lucrative work in short order. Congratulations to you and your family.
because he accidentally stumbled into a bug?