What are the barriers Amazon is encountering in the EU and how should Amazon deal with these barriers?

The barriers that Amazon is facing in the European Union is that it has an inquiry that if it is using the third party apps at the cost of other retailers

Explanation:

Amazon has been reported that they use the third party apps to gain the attention of the customers and they sell the products at the cost of the other retailers and the other third party users face a huge loss

And they had opened a formal investment by the antitrust investigation to check the usage of the third party apps that if amazon used these to promote its own product at the expense of others