The best pictures of your wedding are on someone else’s phone
Ask any couple six months on and they will tell you the same thing: the shot they love most is the one a cousin took from the wrong angle. Your father wiping his eyes during the speech. The flower girl asleep under the cake table at ten thirty. Nobody was commissioned to take those, so they exist only where they were taken.
Getting guests to shoot is never the difficulty. Getting the files afterwards is. You send a polite message to sixty people, four reply, two of them send screenshots, and the rest promise to do it over the weekend. By the time you are back from honeymoon the moment for asking again has passed.
Collecting during the party is what changes the outcome. A guest who has just photographed the sparkler tunnel will upload it while still standing there; the same guest, three weeks later, will not. That is the whole idea: one code, nothing to install, and the photos arrive the same night they were taken.