You may want to start with the related article: The Decomposition of Rotten Tomatoes: The most overrated metric in movies is erratic, reductive, and easily hacked — and yet has Hollywood in its grip.
Critics have long been accused of accepting money from companies in exchange for a review of their gadget, book, or movie. Most writers would scoff at the idea, but the practice is widespread—and growing.
Archive link: https://archive.ph/JezNe
This has been obvious for years now.