Also a good fallback if your phone screen cracked 2 hours before. But I can imagine part of the challenge they are facing here are scalpers. TicketMaster app 'rotates' the actual ticket every 30 seconds. Can't rotate paper.

I'd think that having a 2nd factor like presenting ID that matches the ticket would be sufficient there though.

You don’t need the app itself to get the rotating tickets, the algorithm is pretty dumb and was reverse engineered back in 2024. https://news.ycombinator.com/item?id=40906148

You probably still need a device of some kind though.