Apple became the first tech giant to be charged under the EU’s Digital Markets Act on Monday, just three months after Brussels officials first opened their investigation.

According to the EU’s antitrust division, the Cupertino, California-headquartered company’s App Store rules do not allow app developers to freely communicate with their own users. This violation of the DMA could result in a fine of 10% of Apple’s global turnover, although the decision is not yet final.