If you are building for yourself instead of buying from someone else, you haven’t unlocked any value in the economic sense. Perhaps by making NVIDIA richer, but who knows how much they have indirectly spent through AI companies these years to get your couple dollars a month back to Jensen’s pocket.
I've been using it to build things that don't exist in the market (or GitHub). Either where the product just doesn't exist, or existing products do not fully meet my requirements.
For example I got a smart cat litter box and wanted to pair it to Home Assistant. There's an existing integration for the manufacturer, but it seems that although my box has the same model number, it's a different revision with completely different data point mappings - so the existing integration doesn't work. I pointed AI at it, and it figured it out, and it works.
Could I have done it? Sure, if I'd spent an entire afternoon doing it. I don't care that much about my cat litter box though.