OK, fine; I am speaking of those entities who originate and collect payment on a home loan. You pointed me to a government-sponsored enterprise that places an insurance stipulation in the terms of its voluntary contract with lenders who wish to guarantee or pass-through their loans.

Granted, almost no one will originate a subprime loan these days, because everyone in the private-label MBS business got out or was bailed out, so the best this example shows is a de facto standard set by the guarantor of last resort.