17 years ago, there was a popular essay about this sort of person, and the label at the time was "Free Electron": https://randsinrepose.com/archives/free-electron/ Before that, they were known as "generalists", autodidacts, polymaths, etc. The thing is that pretty much any clever person that's easily invested in novel things can become one of these people, so this label isn't reserved for people who are generalists,…
I'd be interested in seeing if other wildcard types actually care about this? Beyond living well of course, need cash for that. My drive is dopamine, not money. As long as I'm fed and not in debt I couldn't give a rat's tail how much I'm earning. I'd take a hefty pay cut to jump on a "hell yes" project.
Very easy to say. Let's get back to it when you have actually taken a hefty pay cut.