The angel investor couldn't just sit around and hope he gets a job, since he spent all this money it's in the angel investors best interests to not only get this kid in the right school, but to also line up employment for him afterwords using his own track record as a referral for a particular position.
Personally, I would prefer that the government or community would "care" through all your life as USSR did. Selling yourself as a slave to the private investor or corporation is inhumane and I think these contracts won't be ever enforced in the most countries!