9th amendment.
It's the best amendment, despite being, legally, the most useless.
I would argue that it was meant to cover the kind of situation where a private company is given government permission to gather surveillance data from the citizenry, in exchange for access to said data.
Yeah, I straight up don't respond until they've asked/said the thing that they're contacting me for.
Usually they finish their thought without me ever needing to respond. I did have one coworker who just... never said anything else. That's also a win.