Orphan Black

Anyone else obsessed with Orphan Black? The final season just started and I've been obsessed since Day 1. But, I just realized, have the ever answered the WHY? of it all? Why were the clones created? What does Dyad want with them? Just a general WTF is going on with it all? It's been so long between all the seasons and so much other TV happens in between I may have just forgotten if it was ever actually said in the show.

So, anyone have any answers?