People obtaining the show from other sources before it is released on Netflix might be a reason for the show not doing well enough on Netflix to be worth picking up. Plus the marketing probably was only half-hearted, since Netflix doesn't own the US streaming rights.
They do weekly releases for some shows (maybe most shows that they don't produce themselves).
I assumed it was some ridiculous commercial arrangment that meant they couldn't show it until after the season has finished in the states - but I have no idea
