Why does anyone read Yelp reviews? They're gamed, and also used to extort businesses. Why does anyone read Glassdoor reviews? They're completely gamed by the employers[0], and the company itself recently pivoted into brand management - which translates into fake reviews being their core product now. Why does anyone read Amazon/eBay reviews? They're gamed too! Why does anyone read reviews on random small e-commerce sites? Those often aren't even reviews, they just look like them!

It's because most people don't pay attention and didn't figure out yet that on-line reviews in general are worthless, thoroughly gamed bullshit. Those who did figure it out - they don't stop using Yelp/Glassdoor/Amazon/eBay/Google Maps anyway, because those services still offer enough value to customers compensate for broken reviews.

So if regular users will be there either way, and manipulating reviews - or allowing them to be easily manipulated - increases retention of paying customers (businesses), which way the incentives blow?

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[0] - https://news.ycombinator.com/item?id=24789865