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).
I'd do it if you could leave fully anonymous reviews. But I'm not about to review products with my real name attached to them, even if it's just first name.
I know two, plus one other who only reviews when it is very bad. Just always look at middle and low end reviews, and be very extremely choosy about sellers, and roll the dice.