Wasn't there some sort of concept tech for an airport, where cameras detect and recognize you, and then ensures that any screen that you can see will have the list that has your flight on it? Moreover, the thing about this tech is that the same screen can show different lists simultaneously for different people, simply based on their position and the angle at which they view the screen, if I remember correctly.
I know that at least in China (and I think a few airports in the US) have screens you stand in front of and immediately show your flight information by scanning your face.
They have this as a demo at DTW airport where you scan your boarding pass, and it displays on the massive main screen entering the terminal "Welcome (Your Name)" with your flight information, but only you can see. I don't remember the maximum number of people who can use it independently, but It's insanely cool technology nonetheless. I really hate the reality that it'll probably only be used for personalized advertising though...
I've got ads and tracking pretty tamped down on my own devices, but it's honestly terrifying how often when I hang out with friends who have non-FOSS phones or Windows running in the room that Amazon is later trying to sell me the topics of the conversations we were having. And it's really hard to have a conversation with someone who isn't as sensitive to this, to tell them that their devices and software are compromising my privacy, and to get them to understand that as the consent issue it truly is.
I have ads managed very well on my personal devices. I looked up camping stuff once on my work computer, and that is all I get on there now. Like, that's all they have on me, so that's what im going to get forever.