Italian regulators have fined Amazon $1.3 billion for promoting third-party sellers that buy its extra services over other sellers.

Amazon is the biggest e-commerce platform on the planet and, as such, serves as a gateway for countless other companies looking to sell online. Unfortunately, Amazon’s position as the market leader also makes it the gatekeeper for those third-party companies. The decisions it makes about which companies to promote can mean the life or death of a smaller company’s business.

According to Italian regulators, Amazon has been abusing that position, favoring sellers that buy into its extra services over sellers that don’t. As a result, Italian antitrust regulators have fined the company $1.3 billion

Amazon provided a statement to GeekWire disagreeing with the ruling.

“We strongly disagree with the decision of the Italian Competition Authority (ICA) and we will appeal. The proposed fine and remedies are unjustified and disproportionate,” Amazon’s spokesperson said.

“More than half of all annual sales on Amazon in Italy come from small and medium sized businesses and their success is at the heart of our business model,” the spokesperson added. “Small and medium-sized businesses have multiple channels to sell their products both online and offline: Amazon is just one of those options.”