Interesting question what the last Microsoft product Bill Gates had a direct hand in developing was, it might have been Windows 1.0 or maybe not even that. He said in an interview a few years back he enjoys fiddling in Python from time-to-time but that he hasn't done much real programming in decades.
The fine art world is a racket but it's not the racket some seem to think it is. Saw a meme a while back purporting to be about how the super-rich launder money by getting unknown artists to produce art on the cheap and then get it valued at some absurd figure.
That's not how the art world works, the super-rich don't typically solicit unknown artists to produce anything for them and if they did the work doesn't become automatically valuable to everyone just because they demand a single appraiser say it's so.
Artists who are well-known in the fine art world also know what their work is worth and they tend to charge appropriate rate to produce it, particularly to people with the money to pay it. It then gets appraised near the time it was produced at about what it was sold for at that time.