I urge you to think deeper about this. You are saying these people chose to list their time, but why do they consider it in the first place and why don't you? Alternatively, think about the array of choices they have to make money and yours.
I'm not saying its an immoral service. I'm implying that "distributed labor" startups are problematic for me to participate in as a customer because I find the notion of spinning up people like we do servers to do tasks that I can buy my way out of to be problematic.