It's probably some weird DRM where it needs to authenticate with their server in order to verify you're actually the one with an account. It's silly. The steps they take to try and stop piracy are what in fact drives most people to it.
I started downloading shows from several streaming services I pay for simply because of the number of repeating ads they'll run during a show. A 24 min runtime gets extended to 45 minutes for all the ads, which I was sitting through for months but when they only have two different ads on loop, WTF!? A man can only take so much!