>over 220M cups purchased daily at coffee shops, cafes, bakeries and diners. Starbucks is the largest chain, but they only process 2.5% of those daily sales.
220M is quite a lot for a single day, representing about 1 cup per day for roughly 80-90% of adults in the US. I could believe this if the statistic were "brewed" and included coffee bought in bulk from supermarkets/other suppliers and brewed at home or the office. Even if this metric is using "cup" as a unit of volume and not a single sale (since a venti coffee at starbucks is many cups) it still seems very high to me.
I guess this question is at least somewhat relevant since it's how you're pitching your app to investors and represents the size of the addressable market.
One other question: how do you plan to address competition from non-specialized food-ordering apps? My understanding is that food delivery/takeout and other order-ahead services often include exclusivity deals, and I could see many cafes and diners opting to choose a non-optimized ordering experience that allows them to sell and deliver food over one that primarily focuses on coffee.