How do you read the tweet? It seems pretty clear that he knew that getting paid back wasn't very highly probable, and he learned about how recipients handle that.
More to the point, Carmack was comfortable - had a house and was able to put food on the table for his loved ones - without being paid back. It's possible that, contrary to what that tweet says, Carmack demanded (his) money (back). By Western measures, however, he's still comfortable without being paid back.
>It's possible that, contrary to what that tweet says, Carmack demanded (his) money (back)