I got the answer when it was featured in october, but not on my second take yesterday because of the word "industry". It's clearly misleading. Maybe I lost my head a bit yesterday but I actually tried textile and weapons instead of banking... "Business" would be more suitable.
The Medici famili "originated" from War victories, its fortune from the culture of the so earned territories, then from Medecine and Pharmany "industry", then from Wool Industry and commerce; and then "only", at the XIIIrd century, they invested this coming fortune in Banking and grew it up.
I'm guessing it's because they already give you the "Vinci" clue (so putting "da Vinci" becomes almost trivial), but maybe they could reword the hint so that "da Vinci" would become a valid answer.
Or specifically mention they are after the first name. When davinci doesnt work, it is not a big step to try leonardo. But it is rather weird that the correct answer is treated as incorrent.