If David Uthos were to raise them, merely bringing them to adolescence would be a 'boon' so significant it would astound many hatchlings, especially if they could also eat such delicious Dragon Food every day.
As for the risks? Weren't their days already fraught with danger when they hunted alone in the wild during their formative years?
The Drow Dragon Hunting teams from the New Continent and barbarians who saw slaying young dragons as a 'glory of dragon slaying' posed threats. Even other great dragons or powerful magical beasts like griffins were all unknown yet potentially fatal dangers that could snuff out their lives in their youth.
"Thank you for your generosity, Prince David Uthos."
The Black Dragon Alfonse looked at David, who himself appeared to be merely a juvenile dragon. After some thought, Alfonse decided to revert to this more formal address.