We are all talking about exceptions to the exception at this point. It's typically uninteresting to discuss...

But at the risk of being uninteresting, I know of incredibly niche software projects that were done for a single rich benefactor as one-offs simply for their personal use-case and no one else. Years in the making and quite well paid. In one case effectively lifetime employment for the sole developer.

They are obviously incredibly rare, but they do exist.

However, they are totally irrelevant to discuss in this context since it's a rounding error of 1% of 1% of current developers who would get such roles either via luck or skill.