At that age in the mid 2000s, I would be foaming at the mouth to tell a FANG company to eat dirt over something like a disclosure + unpaid bounty. But if he got the money and didn't negotiate... You live and you learn.
Well yeah. Why else would you tell off a massive company in the FANG circle as a budding security researcher in their teens.
A good move is to negotiate in good faith. You show you can’t be pushed around and you are able to be civil. And most importantly, you know your worth.