Then expect more men to avoid the contract.
Accding to the few facts offered here, the man certainly was not constrained into marriage. He could have hired a nanny and maid--but it would seem that he wanted the particularly personal kind of service that a homebased wife/stepmom would provide. That appears to be what he sought for his own benefit. After the child approached majority, it would also seem that he was ready to discard his erstwhile "servant". What a great deal that would have been for him.
It also looks like he allowed his wife, when a fiancee, to get involved in a sentimental arrangement only to present her with a cold prenup after she was commited to paying for the wedding.
I wonder what kind of a prenup you'd like your daughter to have to sign?
Nope.