I doubt highly that any of that is the concern of the stadium. Most likely, each concession is leased from the stadium, and is run as an independent business.
Perhaps. I think you’re right that the data might be part of it, but I have to believe there are practical/efficiency interests as well. Certainly they know that they’re already at a certain percentage (high) of cashless transactions so it’s not a risk to go all the way.
If 60% of the stadium’s transactions were still cash, there’s no way they’d be doing it.