Broadly, the DMA is the EU’s attempt to rein in the market power of Big Tech by opening up entrenched platforms and curbing ecosystem lock-in and anti-competitive behavior, making them compete on the merits of their products and services alone. Major messaging apps will have an obligation to make themselves interoperable with competitors, for example, while operating systems will need to be designed to offer third-party app stores and allow developers to offer alternative in-app payment options.