Why do they keep asking for an ESTA when leaving the USA?
Americans do not need an ESTA to enter USA, and no one needs it to leave¹. Yet every time I've booked a flight in recent years, I've been told (I ignore it) that I need an ESTA for flights to/from the United States. It never says anything about citizenship, and it always says "to/from." Several airlines from different countries.
Are they all copying standard text written by someone unqualified or lazy?
Per one request, here's an example: 
¹Does an American citizen need an ESTA to leave the United States?
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