From Cupertino to San Francisco, a growing consensus has emerged that screen time is bad for kids. It follows that these parents are now asking nannies to keep phones, tablets, computers and TVs off and hidden at all times. Some are even producing no-phone contracts, which guarantee zero unauthorized screen exposure, for their nannies to sign.

The fear of screens has reached the level of panic in Silicon Valley. Vigilantes now post photos to parenting message boards of possible nannies using cellphones near children. Which is to say, the very people building these glowing hyper-stimulating portals have become increasingly terrified of them. And it has put their nannies in a strange position.

“In the last year everything has changed,” said Shannon Zimmerman, a nanny in San Jose who works for families that ban screen time. “Parents are now much more aware of the tech they’re giving their kids. Now it’s like, ‘Oh no, reel it back, reel it back.’ Now the parents will say ‘No screen time at all.’”