The "strength" of the evidence is arguable, but it is definitely evidence. If the risk calculus you did ended with you choosing donating, then you know that the

The "strength" of the evidence is arguable, but it is definitely evidence. If the risk calculus you did ended with you choosing donating, then you know that the probability is non-zero that each incarnation of you would choose to donate. But not "strong" evidence -- this is flipping a coin once, getting heads, and saying you have strong evidence that the coin is biased towards heads. You have evidence, but I'm not going to stake much on it. As for the infinite aspect, infinity doesn't mean uniform - there are an infinite number of odd numbers but none of them are even.