Maybe presently people have no major beefs with the organization.
But there have been more than enough negative actions by this company in the past including:
Suing craigslist (and losing) for breach of fiduciary duty because it wouldn't exploit its users enough. This was knowing that the shares were acquired in conflict with the ownership and mission of craigslist.
eBay tried to get inside information from Craigslist while it was secretly preparing release of Kijiji.[1]
eBay has been facilitating the sale of counterfeit items long before Amazon. Many sellers were upset by the requirement to use PayPal anded even acted to ban use of competing services.
So while the heat may be on Amazon, I would hold off on elevating eBay to some superior ethical position.