Google and Apple provide and maintain 2 of the largest app markets in the world. The Dutch Authority for Consumers and Markets has decided to investigate them with regard to how third-party developers are treated on these platforms compared to their respective first-party counterparts.
https://www.notebookcheck.net/Dutch-competition-authority-is-investigating-Apple-Google-for-the-possibility-of-app-store-monopoly.417481.0.html