Good news, the paper mentions privacy.

> We identify a number of critical issues that need to be addressed in this space... First, individuals should be provided the opportunity to opt out of SENS services – in other words, to avoid being monitored and tracked by the Wi-Fi devices around them.

Bad news, the paper proposes remote human identification by every Wi-Fi device.

> This would require the widespread introduction of reliable SENS algorithm for human or animal identification.

Would opt-in be legally easier than requiring human body scan registration for opt-out of Wi-Fi remote sensing?