I used to trust them a whole lot more, too. But of late it seems Amazon is leaning toward a cesspool of price gouging, and I've noticed a lot more of the presented results are "Sponsored".
Along with that, I stream movies on my TV, running clients, usually Netflix or Prime Video, on my xbox. Increasingly the Amazon prime video client wants to present me with options to "Rent or Buy" instead of free offerings (I am a Prime subscriber after all, and seek to take advantage of the free streaming offerings), sometimes a page of results will contain nothing but pay-to-play offers.