While I'm happy with the restriction, especially after being stuck next to some wannabe "influencer" on a flight once, where they spent half the flight talking into the camera (and with multiple 'takes' for just about every idiotic comment and "spontaneous" action and thought)
The part that piqued my interest though was:
"...in the case of any failure to comply with the direction we may retain the device"
This is both vague, poorly worded, and loaded with unstated implication.
By "retain the device" that is clearly implying seizing the device.
By what authority would they do that? And by what means will they enforce it?
What if the passenger refuses a request to hand over a phone or camera, especially if done so politely?
Are they going to divert a flight to have police detain the passenger?
And what do they mean by "retain"? That carries the more direct implication that they may hold the device indefinitely; after the flight.
This is incredibly poorly worded and is going to cause then a bunch of headaches. It is hard to believe any organisation with access to the legal resources of QF would put out something so liable to cause problems as this.