I'm literally the only person I know that does reviews on amazon.
That's including a circle of a dozen plus relatives I'm friendly enough with to make small talk, three good friends, my wife, my disability/chronic pain support group, the volunteer group I take part in, and a handful of online friends.
Like, you'd think one other person would get bored in the middle of the night and do reviews of stuff that they buy.
But there's always a shit ton of ai generated or copy/paste dreck you have to wade through to get to real people, and even then they may be shills or have been paid to change a review (no shit, I've been offered double and triple the original cost to change bad reviews).