Great way to create an understanding of how people might interact with a service. Some of it is pretty far in the future (like learning the new fist bump) but the consent aspects are most interesting to me.

Why wouldn't the robot automatically assume deletion of data other than for people that have opt-in?

What happens if someone doesn't see the sticker (or can't)?

You should check out the work of Applin and Flick regarding FB project Aria and the privacy consent issues that come up for that: https://www.sciencedirect.com/science/article/pii/S2666659621000032