“we like every especially in the beginning every week we would go to mcdonald's and pay a meal to student or anyone and we would like pay the meal in exchange for downloading the app and yeah blindly test yeah”

McDonald's User Testing: Pay for a Meal, Watch a Stranger Use Your App Cold

PhotoRoom's early user research method: buy lunch for anyone at McDonald's in exchange for watching them download and use the app from scratch. They discovered users never reached the core magic moment (background removed) before dropping off. This directly drove the decision to surface the WOW effect within the first 3-4 taps of onboarding.