Have you ever wondered how it was possible that there are sellers in eBay with hundreds of thousands of positive feedbacks? How can nobody complain?

In reality it is not that nobody complains, there are simply laws that protect retailers from "defamatory accusations". Most of the negative feedback that users release are not correctly formulated and allows these retailers to defend themselves, sometimes requiring a real compensation for image damage.

You got it right, there are people who live asking for damage to customers who give negative feedback, we're talking about € 600 (in Europe).
There are automatic procedures that do not require passing through the court.
PixalProjects also has experience in e-commerce platforms like eBay and Amazon and can also defend you from negative feedback.