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It's not hard to subtly stick a small flat wireless speaker to the wall, and by the time they notice it the attack is already complete.

1. It's easier to connect to the wifi from across the street, without setting foot on the premises or showing your face on camera.

2. I'm not claiming that all attacks will be mitigated, but that this is an easy win from a cost:benefit analysis.

The difficulty isn't in connecting to their wifi, but rather reverse engineering this bizarre backdoor just to project your voice in the elevator.