Has anybody, other than Nvidia, figured out how to make money with one of these things?
Yes and no, it depends what market you are in. While everyone is busy drooling over a better chatbot, the real money is in data analytics and forecasting. I've said it before but all these "AI" algorithms are doing is predicting "yes and". The "training" is just analyzing ridiculous amounts of data and building a model that correlates every data point with every other data point to form a giant probability mode. Afterward you can feed it a string of data elements and it'll predict what the next elements
should be. You say [F,B,E,H] and it responds [A,Q,B,D] as the most likely following elements. The entire thing is just a pattern prediction system, in the case of natural language processing (NPL), which is what ChatGPT does, the patterns are in our English language lexicon.
Now imagine feeding it the daily/hourly percentile price change of the S&P 500 for every day going back thirty or more years as "Training" data. Then putting in this weeks daily/hourly price and letting it "guess" next weeks price values. See how accurate it was, adjust the model, feed more data, then do another estimation run. Keep doing this until it starts to accurately predict the patterns. Congrats you can now almost print money.