If it were possible to get 9800 mah out of an 18650 we might all be flying around with electric jetpacks. About the best capacity possible today is 3600 mah. This has been going on for years: https://www.youtube.com/watch?v=gGF9DZcBric
Fake or misleading battery products are so common on Amazon there is an ongoing class action suit: https://www.classaction.org/news/amazon.com-hit-with-class-a...
The truth is that it is possible to police the suppliers, resellers etc. to prevent this, and Amazon has both the power and resources to do it. Amazon just doesn't give a damn.
https://www.birkenstock.com/us/us-policies-counterfeits.html
https://footwearnews.com/2020/business/retail/birkenstock-am...
https://www.nbcnews.com/tech/tech-news/birkenstock-ditches-a...
Giving the benefit of the doubt, I feel I must be buying different things?
I did once however report that a power strip I had bought, knowing ahead of time it was super cheap, was designed in such a way that you could touch the live power pins because it was rounded and that I had shocked myself. That report seems to have gone nowhere