March 6th marks a long-awaited moment of change: it’s the deadline for tech’s biggest “gatekeepers” to comply with the European Union’s Digital Markets Act, or DMA. The DMA requires powerful companies to allow more interoperability and avoid preferencing their own digital services. In general, designated platforms must take proactive steps that the EU believes will make digital markets more fair and open. For example, gatekeepers must let third-party companies interoperate with their services, they can’t favor their own products in rankings over competitors’, and they can’t condition app store access for outside developers on using their payments systems or other services.