This is a company that is working very hard to provide an ADDITIONAL source of candidates, emphasizing traditionally under-represented groups. If it helps you any, put it in a different context: think about a recruiting firm focused on helping small-town Americans. They would put you in their job pool if you live in a town that has less than 25,000 people or whatever. Would you make the same complaints about that service?
Good companies will ALWAYS source candidates from many possible routes. The worst companies now are the ones that only hire friends and family or people with "culture fit" (often thinly veiled term for "reminds me of me"). Those are not hiring from a very large pool. There is no company doing the opposite ("I will only hire people not referred by friends"), and to complain about a possible straw man future where Jopwell becomes a monopoly, putting Dice, Craigslist, and every individual recruiter out of business is laughably easy to dismiss.
I haven't looked at Hacker News much recently, and I had a self-imposed 2 year ban on visiting it that I kept to until then. Comments like this are literally making me tear up and wish I hadn't come back. :(