I'm not quite sure I understand your point? Of course he got paid, that's how bug bounties work... that doesn't detract in any way from the point I made above.
And I don't understand yours. You were concerned about other people other than Wes accessing the same data via the same flaw, Alex said that did not happen.
But until Wes told them, they had no evidence that Wes was accessing the data! Or are you saying that they did have evidence, but chose to take a "wait and see" approach to someone gaining control of their entire platform?
Alex said they "have no evidence" it happened, which is classic slippery legalese. From that phrase it is reasonable to infer either that they have evidence of absence, or absence of evidence, which are not the same thing.
Correct. It's the standard wording, whether or not they actually have evidence. Therefore we cannot assume, as you have earlier in this thread, that they do in fact have it.