This gets more complicated as they may go after gig economy workers first. They're a perfect target: the scalper's deal would have better reward/effort ratio than Uber, DoorDash, Deliveroo, et al.; gig workers look "normal" in ways homeless don't, and are desperate for cash to keep them from becoming homeless.
At that point, would scalper's contribution be net positive? Net better than it was? I'm not sure how to answer that.