It's funny to me how something will come up repeatedly in conversations with different people, then pop up in real life, too.
In several interviews I've done recently with DOOH providers/networks/etc., one benefit they all mentioned was that digital signage allows end-users and brands to make sure they don't advertise for their competitors in their stores.
A Mercedez-Benz dealership, for example, might have screens that end up showing commercials for BMW if they're just using a TV feed, but can make sure they only promote their brand if they have a dedicated digital signage content feed.
So on a recent road trip I stopped to get something to eat at a fast food quick service restaurant when this ad came up on their "digital signage":

And no, the restaurant I was in right then wasn't White Castle — but the next one was.
(Also, all those wires? That's just sloppy, guys. C'mon, you're better than that.)