I got the impression that it's similar to Amazon, where officially no 3rd-party-seller sales information (from the Amazon Marketplace) is used to decide what pr

I got the impression that it's similar to Amazon, where officially no 3rd-party-seller sales information (from the Amazon Marketplace) is used to decide what products Amazon would sell itself, but it later came out that they simply lied about it and did use the data to get an advantage.