How does this work with the way these delivery apps work?

Correct me if I’m wrong since I’ve never worked for one of these outfits, but the way I understood it was anytime you want to work you just log into the app and make yourself available, and you randomly get assigned nearby jobs. If there are no jobs to do (middle of the night or w/e), then you get no pay. With this change, when are you eligible for the minimum wage? If everyone in NYC logs into the app at once, will everyone get minimum wage?