I've become a lot more jaded about online reviews over the years.
I had an Amazon review removed because apparently mentioning that a competing product is more effective goes against their TOS.
I had a WordPress plugin review removed because apparently a critical vulnerability that got our site hacked isn't a valid reason to give it one star.
I had a local BBQ chain offer to give me a free bottle of sauce if I let them watch me give them a 5-star rating on Google.
I've seen tons of video game and app websites apply "anti review-bombing" measures to factor out thousands of low ratings for being supposedly off-topic, often for major games that they're financially affiliated with through sales or advertising.
And that's just for third-party websites. If a company's website has customer ratings/reviews for their own products, then the conflict of interest is too great to even pretend that they might be legitimate.