Here’s how WhatsApp plans to interoperate with other messaging apps

As noted by Wired, WhatsApp wants the messaging services it connects with to use the same Signal Protocol to encrypt messages. Meta is also open to apps using alternate encryption protocols so long as companies can prove they reach the security standards that WhatsApp outlines in its guidance." The third-party services will also have to sign a contract with Meta before they plug into WhatsApp, with more details about the agreement coming in March.

Emma Roth at The Verge

They way this should work is that these megacorporations create free and open APIs any instant messaging application can tap into. I'm not looking to bring other services into WhatsApp; I'm looking to bring all services together in one unified application that respects my platform's conventions and integrates properly with the operating systems I use. I feel like this contractual interoperability Facebook (and Apple) is offering is not interoperability at all, and does not reflect the spirit of the Digital Markets Act.