I don't see the ethical problem. I'm paid significantly less than the economic value of the labor; this is because my company does a lot of coordination work to connect my labor to clients who need it, and I'm not particularly good at that kind of work so I can't effectively do it myself.

I don't think "reliant on the whims of a couple of billionaires" is a fair characterization. In what way does the average person rely on the whims of Larry Ellison?