It could also be that you are reading too much into it.
>"Here is a partial list of Coinbase user emails and their full names. Full list much bigger."
Where does it say in that sentence that he the OP has access to the "full list"? It doesn't say that. It implies it, which you picked right up on. But he doesn't explicitly say, "Here is a partial list of the full list in my possession".
It could also be that you are reading too much into it.
>"Here is a partial list of Coinbase user emails and their full names. Full list much bigger."
Where does it say in that sentence that he the OP has access to the "full list"? It doesn't say that. It implies it, which you picked right up on. But he doesn't explicitly say, "Here is a partial list of the full list in my possession".