>>47054234See:
>>47054105They collabed, viewers liked their interactions, art was made by fans, etc.
It's unlikely that it was artificially designed by management as part of some sort of master plan, though it's obviously endorsed by management when they see a popular ship that sticks, so they cultivate it.
I think one reason why Fauna isn't shipped very often is because ships aren't sticking with the saplings. They just want her for themselves.