Consumer reports is one that comes to mind (they are also non-profit), as well as rtings. If you are looking for reviews for more niche products though, your pretty much on your own when it comes to finding out if its good or not.
https://terrylove.com/forums/index.php?threads/consumer-repo... is an example.
You used to be able to find forums and similar for almost anything; now you’re left with Reddit threads and half-remembered comments. Anything under $50 is just a crapshoot.
When google removed the option to search discussion boards I knew the internet was changing and the changes were going to be bad. Google discussion search was the most powerful tool to find real world information. You could put in the model number of some product you knew nothing about (e.g. a camera or boat motor) and discussion search results would reveal many different forum threads where professionals and aficionados had discussed the product in detail; those same forums were already hard to find and a search for "boat motor forum" wouldn't necessarily bring you to the same forums and even if so, requires many extra steps to arrive at the same thread.
They make money through affiliate links, but they claim that the writers/reviewers have no knowledge of which companies have affiliate relationships with the Wirecutter so it doesn't bias their picks.
That said rtings at least standardizes their tests so you can ignore the editorialized part of the review.
It convinced me that the people writing these "reviews" have no idea what they're talking about and cannot be trusted. When the recommendations are for categories that I'm not an expert in, they can recommend whatever they want and I can't dispute it. When it's for a category that I know something about, and the recommendation is for the very worst kind of cheap junk product, it does raise a lot of doubt in my mind.
Not wanting to derail the discussion but if it was that that put you of the review site you mention, it could be worth reconsidering..