I misread this as she was showing you how to get around the facial recognition software at the pool and was very confused at the end of the first read.

I'm guessing there's not much protesting or picketing in your family, because that seems like the obvious risk.

Maybe something like "that facial recognition data might later be used to log into bank accounts, and if the swimming pool systems get hacked, that could be bad/we'll be glad we didn't use that system."

If you need some examples on publuc cameras thay got hacked, I can dig up some on ALPR data breaches. It's not exactly the same, but a concrete example can sometimes help show people that these types of concerns are not merely hypothetical.