Many of the online stores I shop at have offers like “leave a review and you’ll get a coupon for your next purchase”, so they get a lot of pointless reviews like “It arrived. Didn’t try the product yet. 5 stars”
I find that there’s a very strong correlation between the average age of the customer base and the uselessness of the reviews.
What are the odds that the random website it gave me was my physics study guide in high school? The Hyperphysics website