How many movie cards can they put on a screen at once...10, at most. How are they supposed to show you what is "on offer"? If their catalog were 10x smaller or 100x larger, they can only show so much.
I supposed they could email customers an excel document. But short of that, they have to make choices about what to do with the pixels on their page, and those choices represent filtering what they show you. How is "hampering discovery" different than what they are physically forced to do?