Last weekend my wife and I wanted to watch the movie Goat. It was pretty recently in theaters, so we didn't expect it to be on Netflix. We searched HBO Now, Hulu, Starz, and all of the other video streaming services that we have (and pay money for!). We found two options - rent it on Google Play Movies, or rent it through Amazon Prime. Now, we wanted to Chromecast it, and Amazon (to the best of my knowledge) does not allow you to do that, presumably because they want you to buy their Fire TV instead.
So, we spent the $6 to rent the movie on Google Play. About 10 minutes into the movie, the quality plummeted and playback stopped with an error code. We called customer support and they talked us through possible solutions for ~35 minutes before we gave up and asked for a refund. It wasn't a problem with our Wifi, since Netflix/Youtube and other services worked just fine, it was a problem with Google Play streaming to the Chromecast.
After searching and trying for over an hour to watch a movie legally using paid services, we went to putlocker, plugged an hdmi cable into my computer and streamed it just fine. We really, really tried to do it the legal way and pay money for the content we wanted to watch, but it was far too complicated to even find a place to watch it, let alone actually successfully watch it. I was reminded a lot of this comic http://theoatmeal.com/comics/game_of_thrones throughout the whole thing. All of this fragmentation is going to become a huge problem again, when piracy is just so easy and convenient.