I see your Hanlon's Razor, and I raise you Hanlon's Handgun of mine:
"Never attribute to stupidity that which can be adequately explained by systemic incentives promoting malice."
I'm not sure what makes Google so different that it should be exempt from general trends around reviews. Businesses have their interest aligned here: removing negative reviews and faking positive reviews are beneficial to each individually, and can't be directly weaponized against competition. Google has no strong incentive to keep reviews honest; regular users will not replace Google Maps with OSM over a review issue, while a business might want to stop paying Google if they get bad experience on the marketing front.
> Google has no strong incentive to keep reviews honest
Have you actually thought about this at all? Why on earth would ANYONE bother reading reviews that they know to be categorically fraudulent? Without keeping the reviews honest, at least to a degree that the general public considers them honest and legitimate, Google Maps Reviews becomes worthless and a dead product. Fake reviews are a very real threat to their product's value and Google arguably has very good strong incentives to keep reviews honest so people keep using them.
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?
"Never attribute to stupidity that which can be adequately explained by systemic incentives promoting malice."
I'm not sure what makes Google so different that it should be exempt from general trends around reviews. Businesses have their interest aligned here: removing negative reviews and faking positive reviews are beneficial to each individually, and can't be directly weaponized against competition. Google has no strong incentive to keep reviews honest; regular users will not replace Google Maps with OSM over a review issue, while a business might want to stop paying Google if they get bad experience on the marketing front.