‍Matrix is a UK-based nonprofit whose project is to make instant messaging and VoIP ecosystems interoperable, as the ecosystems on which email relies can be.

The DMA (Digital Market Act) is a proposal for a European regulation "on fair and contestable markets in the digital sector", in other words, a regulation that tackles the thorny issue of control to be applied on large digital platforms(e.g. Whatsapp, Facebook...)

The shared article discusses the technicality of such a deployment.

https://matrix.org/blog/2022/03/29/how-do-you-implement-interoperability-in-a-dma-world

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If it's time to pick up the little ones from school and this gobbledygook bores you, don't leave without this crisp quote:

The bottom line is, we should not be scared of interoperability, just because we've grown used to a broken world where nothing can interconnect. There are tractable ways to solve it in a way that empowers and informs the user - and the DMA has now allowed the industry to demonstrate that it can work.  (https://matrix.org/blog/2022/03/29/how-do-you-implement-interoperability-in-a-dma-world#conclusion)

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Other articles in Matrix develop this theme:

https://matrix.org/blog/2022/03/30/technical-faq-on-the-digital-markets-act

https://matrix.org/blog/2022/03/25/interoperability-without-sacrificing-privacy-matrix-and-the-dma

https://matrix.org/blog/2022/02/03/digital-markets-act-and-interoperability-myth-debunking-of-the-gatekeepers-arguments