It would have been more accurate to said "You don't pay unless you get a job" but you seem to be bitter about it, why so?
whereas in reality the banks just didn't care about quality because they'd package them up into securities and sell them on.
LambdaSchool can get money on the long term, when the student get a job, and need to cover their costs now, so the packaging is not a weird thing to do. As long as the people buying them understands what they are, there is nothing nefarious going on.
There may be bad things happening at LambdaSchool but I wouldn't say that this part of the financing is one.