Touchy topic, but I can understand why Google is doing this. it's unfair to generalize but micromanaging at that level is not feasible as well.
99% of the stuff goes back to the companies who then send it to other publications, journos and bloggers. There are some bloggers who actually do buy their own hardware and review it. Ads don't earn enough money to run websites. Hence, affiliation is needed. Even in my case. Benchmark software aren't cheap. Some are as high as $1,000. I know most use pirated ones but you will never get optimizations for every new architecture that comes out. I am planning to buy stuff for video review voice-overs and podcasting and it's insanely expensive. Companies only let you keep things if there's an ROI. There are a small number of review sites who do get to keep, but that's usually for components required to do detailed comparison - like A Vs. B or "Under $500 PC Setup". Don't even try selling it. At one point, Youtubers from Europe sold a very expensive graphic card for a 'second hand' price, this resulted in companies filing a case against the YouTuber and even making him give back the specific review unit. Just because you get to keep it, doesn't mean its yours. "Review units" and media samples come between pre-product and retail units. While media samples are usually the same as retail minus packaging and content differences, they will always be company property. When they give a review unit to you, it is still the property of the company. Only when they give you something as a gift is a gift.
This mess is created by those bloggers who write reviews out of thin air without the product in-hand using product description and specifications, then put affiliation links. Many of them have a bad practice of dividing sub-sections of reviews "First look", "Impressions", "Unboxing" "User experience" and then "Review". The stupidity continued by the mainstream media as well. You can't blame Google for it. Don't even get me started about 'bloggers' who have written reviews (thin air and by taking review units) to win contests done by the same brand- which is a conflict of interest. Unfortunately, most bloggers don't want to understand the consequences of such actions, just so that they can win something out of it.
It's not really a big problem. In a way, it good. Those who just want to know the basic stuff about something, they just put up the product's name. Those who usually want to read reviews typically put the word 'review' after the product's name. Genuine reviewers will be least bothered. Readers read reviews from trusted sources. This will be a problem for newer review website and those shady writers. What's unfortunate is that newer review websites will get generalized.
I've also seen in blogger and PR facebook groups where marketing folks put up notifications that they will provide free food in exchange for zomato reviews- and in some cases- goodies and money as well. User review platforms have started noting down such bloggers and will be creating a blanket ban list to avoid conflict of interest writers in their platform. At least, Google notified it in everybody's interest. Companies like Zomato will not because it's not as big and versatile business like Google where they can have that approach. Bloggers should have some restraint and have their own ethical code of conduct. I remember that few years ago when an Indian tech blogger signed up with Samsung as a promoter but appeared to be shocked when he was asked to wear a t-shirt and stand at the booth for an expo in Germany. Ultimately, it was his fault because he didn't notice the word 'promoter'. Nothing is free lunch. Of course, some bloggers wouldn't mind that in exchange for a free trip to GDC. For many, it is a conflict of interest. Heck, there was a time where wearing a brand t-shirt or having stocks in their companies was looked down as a conflict of interest.
Mind you, nothing wrong in putting affiliation links, unless you are writing a review with no product in hand, plagiarising from other review websites or doing it with the purpose of getting money from a product with high commission rate even if the product is actually bad. Those who do product reviews in exchange of remuneration should be looked down upon.