Might be worth checking out ReviewMeta - it scans Amazon product reviews for unnatural review patterns and provides a report highlighting suspicious activity. They also offer a browser extension.
Amazon is unfortunately not using any metadata information for reviews (probably to prevent easy scraping for competing companies). You can only get it from from html (At least from what I can see).
This is why I use tools like fakespot and reviewmeta to make sure Amazons reviews are somewhat accurate. Sure, it's not fool proof, but these tools attempt to filter the obvious bad reviews.
Since I haven't seen it posted yet, an invaluable tool for sifting through fake vs real Amazon reviews is fakespot.com. They use AI to score every product and crawl an item's review tree (reviews left by the same people for other products) to verify the authenticity of individual reviewers. I've sifted out a lot of shady products AND sellers using this. (I'm not affiliated in any way with them.)
I also use ReviewMeta and it does handle review hijacking. It's not a great experience as a customer, but if I combine ReviewMeta and Amazon reviews and search I still get pretty good products. My basic guidelines are that it needs at least 4 stars (preferably closer to 4.2-4.7) and the product can't be a "fail" on ReviewMeta. I also am wary if ReviewMeta is a "warn".
I don't trust Amazon reviews without a review checker anymore, they used to be much better. The highest reviewed products are often some of the worst. Any product with a 4.8 or better is immediately suspect (though some are fine, especially if they don't have as many reviews).
There's some huge datasets of Amazon reviews available. Stanford has a big scrape out there, plus there's one from Amazon themselves in the AWS datasets.
I wish there was a similar analysis for comments left on boards like this one and reddit (which I left earlier this year because the website just isn't what it used to be).
Although, I would say it's an interesting take on Amazon reviews. A place not many people believe could be as popping as it is.
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