Often it's quite easy to spot these fake reviews. I mean a 10 $ USB-C cable with more Amazon reviews than e.g. the PS5? Sure. The popular "name brands" must really like this as these scammers ruin the collaborative review system for everyone, so people will put more trust in brand names again.

Another funny thing are all the new brands that pop up on Amazon (at least in Germany). They're often picked to sound vaguely familiar (e.g. Orfeld) and trust-inspiring, and their product pages portrait them as century-old companies. Often the products they sell are sourced from whitelabel manufacturers, so you have 20-40 brands offering the same product (for wildly different prices), maybe with some small variation in packaging and color.

Interestingly, some new companies like Anker have managed to build up a good "brand reputation" in 5-10 years, probably also due to the fact that they're no longer at the bottom of the trust chain.