I don’t really understand what you’re trying to ask, but if it’s what I think it’s, here’s a response from Mary
To clarify, third-party stores usually give developers statistics on how their product is doing in the market (number of purchase, rating, history, number of purchased DLC, etc.), but they never give devs any specific data about their customer. This is the main reason why purchase transfer is hard as well as other issues such as: freebies sharing (redeem keys), regional price adjusment (this is done by the store themselves).