They probably do it already. I know for a fact this is an existing practice on Allegro - Polish eBay equivalent. What happens is a boss gets their employees to order their products with on-site pickup, or post + payment on delivery, wait few days, and upload a five-star review. Rinse, repeat. The product is, of course, never sent. The company loses on platform fees, but it's profitable if used to fabricate social proof for new listings, or to compensate for the few negative reviews weren't able to bribe away, that drag down your total rating too close to the point the platform may cancel your privileges or ban your account.
Being a witness to all of this, I no longer trust any particular review. At this point, I strongly prefer to spend a little bit more money, and buy a product straight from a recognizable and reputable brand name.
Being a witness to all of this, I no longer trust any particular review. At this point, I strongly prefer to spend a little bit more money, and buy a product straight from a recognizable and reputable brand name.