seec parent
What you say is contradictory.
If fees and prices are increasing on Amazon it means more potential for the competition if they can operate with lower margins.
Amazon is winning because they toe the line, not because of an innate monopoly.
If you read the parent comments we've already established that Amazon punishes sellers for pricing lower on other platforms than Amazon, and Amazon's margins affect item pricing everywhere. You could have zero margins, you could have negative margins, Amazon will see that Seller X's items are available on your Amazon competitor for $2 while it's $20 on Amazon and say that they're in violation of policy. Unless you make it worthwhile for Seller X to abandon Amazon you will not be able to compete.