I don't live in Silicon Valley anymore but I found it _extremely_ ironic that in my experience, it's the parents that work in tech that are more likely to limit technology usage for their children. (Full disclosure: I'm part of this demographic)
I feel like being fully immersed in tech makes it that much more obvious. My children barely watch TV and we plan on waiting for smart phones until as late as possible. They’ll have a flip phone once they need to call for pickups from sports and such.
Someone on here recently pointed out that a FitBit-style watch where the kid can still be tracked-by-location and maybe receive pager-style notifications is a decent compromise to giving your kid a whole smartphone. That way you still get to limit technology but still reap the benefits of being able to track your kid and also ping them to contact you if you can't get a hold of them.
I wouldn't call it ironic though, when you know how the sausage is made and how toxic it is, it is a logical outcome.
In my child's elementary school (in Silicon Valley) there were no kids with cellphones at any grade level. The school didn't outright prohibit them (although they were discouraged), but all parents had agreement that it was an evil best postponed and cellphones have no place in elementary school. (Not coincidentally, every family had at least one, if not two, parents in tech.)