I guess I'm just at a loss as to what is even remotely "hacker"-ish about this. For one thing, they're going to be standing in a line of people at YC all asked

I guess I'm just at a loss as to what is even remotely "hacker"-ish about this. For one thing, they're going to be standing in a line of people at YC all asked the question "Will people actually use this?" The median answer sort of muddles through it. Their answer will be "We sold $800 of bread in an hour and nearly killed ourselves delivering it all. People actually do want this. Additionally, we have the intestinal fortitude to do things that the line of people you just interviewed did not." There exist severely Fun Challenges (TM) with both the product and marketing side of this at scale, by the way. Delivering 100 orders of bread, once, requires a spreadsheet, a trello board, or even a piece of paper, and exactly one bakery on board. Delivering 10,000 loves a day is going to take some serious ops expertise. It will likely be hard learned.