I think it is natural, as countries modernize and grow economically, that they begin to see diminishing value in outsourcing orphaned kids. It becomes something of a point of pride or pseudo nationalism.

It is also worth mentioning however that many Asian countries in particular have a cultural tradition emphasising the importance of blood heritage etc. That cuts against the viability of domestic adoption in those countries. It is an uncomfortable fact. Nations like China, Japan, and Korea, have work to do in reforming the cultural acceptance of domestic adoption.

As a general principle it seems that the preferred option on behalf of the child should always be adoption by close relative, followed by an adoptive family in their culture of origin, with international adoption as a last resort. Children deserve loving families and any of the above scenarios is better than an institutional orphange in any country.

EDIT: Obviously none of this is meant to downplay the seriousness of adoption fraud. We can all agree that practice is dispicable.