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Online Ratings Are Broken | Companies aren’t asking for your feedback. They’re begging you for data.
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
The implication of "leave a review!" is they want info on quality to improve service; the twist is they don't care about that, just getting information about you for ad targeting.
Reviews are good for convincing other customers that you are a real site and the product is what it says it is.
An ethical company leaves up critical reviews and tries to address the issues their customer faced.
The opposite is a company that only allows good reviews to be published or outright fakes them.
I have worked for both kinds of businesses and I can assure you the ethical businesses care very much about bad customer experiences and use the feedback to improve.