Traditionally a lot of these sponsorship charities only had a few dozen kids' profiles that you'd choose from to "sponsor", since the logistics of cataloguing and maintaining every individual would have been completely impractical. So little Miggy would have ten thousand different people all thinking they were sponsoring him personally, but in reality he was only ever a stock photo to begin with.
I can only guess how much more insidious this will have gotten in the AI age.