Yeah forget that. At first I thought it was a joke of some sort. But I guess that's how you are supposed to do it.
I'll just stick to Netflix and watch videos there. Somehow that manages to work without side-loading a bunch of crap.
(The most sensible-sounding negative claim I've heard is that Amazon do that so that they can do more invasive location tracking than Google permits (though the same kind that Google does themselves))