Earlier quoted context omitted.
Paper tickets can be resold into the tout/scalper market. Electronic tickets can't. That's a nice feature for FIFA.
It seems like it adds a barrier, but wouldn't the scalpers just sell phones with the app and ticket loaded? Old Android phones are quite cheap.
When producing a QR code, the signature could include the date that the QR code was generated, and the date that the phone was biometrically linked to the user (signed by a device-specific key in the secure enclave, itself signed by the manufacturer's key).
Venues could then require that you were using a phone that had been soul-bound to you since before the tickets were first available for purchase.
(For the avoidance of doubt, what I'm describing here is the basis of an Orwellian dystopia, not something that I think should ever be implemented.)