I considered doing this once, a few years ago, but I couldn't figure out a way to make it work.
It's pretty frustrating that when you're shopping for a laptop, nobody can tell you it'll suspend properly under Linux. Or when you're shopping for a bike light nobody can tell you whether over the summer it'll self-discharge to the point it bricks itself due to cell imbalance. Or when you're shopping for a microsd card, nobody can tell you.... you get the picture.
But to produce honest reviews, I couldn't accept free review units, kickbacks or affiliate money. And people shopping for laptops and bike lights don't need a $$$-per-month subscription to my newsletter/channel/patreon, they just need a few yes-or-no answers.
And there's a huge amount of churn in products on sites like Amazon; you wouldn't just pay for 40 bike lights, review them all, and solve the problem forever. Different models and brands appear all the time.
And even then, just because when I reviewed that microsd card and found it had great performance, nothing stops the manufacturer substituting cheaper components later on, without changing the part number; it's not like there was a specification promising the performance I observed in my review.