If I look at any product on Amazon now, say a USB C cable, it’s full of fake reviews. Take this one as an example which came up as a sponsored link - 4.3/5 rated - https://amzn.eu/d/bHCXNQG - 7% of reviews are 1* and variously say that the description is misleading in capabilities of the cable, the cable broke, etc.
If you look at the 5* reviews and click through to any profile writing them, they’re giving out all 5* reviews on a totally random array of cheap Chinese products. On top of that they’re always on products that no real person would buy since they’re always a mixture of things aimed at young/old and male/female, and yet the reviews are all written in the first person. If you’re not at least skeptical you will end up wasting money on rubbish. You have to now look at the distribution of reviews rather than the overall average since fake ones at 4 and 5 star swamp all else.
Here in the U.K. I prefer Argos for small purchases I used to make from Amazon, but it’s not got the full range of items you might want to buy online unfortunately.