I didn't want to make the post body so long that people missed the link entirely, but for those that scroll straight to the comments and just want a summary, some of my thoughts and some excerpts:

It sounds great in terms of facilitating interactions with people that don't want to move off their usual apps, but the encryption concerns are pretty valid, though niche, as well. The other thing that I thought was interesting was the big companies (as well as European government agencies) that have already migrated over. One of my biggest concerns with fediverse services is always the difficulty of convincing people to adopt it, so hearing about cases like that is very encouraging.

It makes sense too - if I were an organization representing a sovereign government, I'd hardly want to be beholden to the whims of private corporate ownership. Governments starting to make official statements via social media has always seemed a bit odd to me, and the recent issues with Twitter shuttering public post visibility do a great job in demonstrating the danger of that dependence. If this article were a bit more recent, I imagine they'd go into that a bit more too.

Some excerpts for people that don't want to read the whole thing (though I'd recommend just doing that!)

The Matrix protocol also supports non-native interoperability through a technique called “bridging,” which ushers in support for non-Matrix apps, including WhatsApp, Telegram and Signal. Element itself offers bridging as part of a consumer-focused subscription product called Element One, where users pay $5 per month to bring all their friends together into a single interface — irrespective of what app they use.

This is enabled through publicly available APIs created by the tech companies themselves. However, terms of use are typically restrictive with regard to how they can be used by competing apps, while they may also enforce rate limits or usage costs.

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A growing array of regulations, particularly in Europe, are forcing Big Tech to pay attention to data sovereignty, with the likes of Google partnering with Deutsche Telekom’s IT services and consulting subsidiary T-Systems last year to offer German companies a “sovereign cloud” for their sensitive data.

This regulatory push, alongside growing expectations around data sovereignty, has been a boon for the Matrix protocol. Last year, the agency responsible for digitalizing Germany’s health care system revealed that it was transitioning to Matrix, ensuring that the 150,000 individual entities that constitute the health care industry such as hospitals, clinics and insurance companies, could communicate with each other regardless of what Matrix-based app they used.

This builds on existing Matrix implementations elsewhere, including inside the French government via the Tchap team collaboration platform, as well as the German armed forces Bundeswehr.

“The pendulum has been clearly swinging toward decentralization for quite a while,” Hodgson explained to TechCrunch. “We’re now seeing serious use of Matrix-based decentralized communications across or within the French, German, U.K, Swedish, Finnish and U.S governments, as well as the likes of NATO and adjacent organizations.”

Back in May, open source enterprise messaging platform Rocket.Chat revealed that it would be transitioning to the Matrix protocol. While this process is still ongoing, this represented a major coup for the Matrix movement, given that Rocket.Chat claims some 12 million users across major organizations such as Audi, Continental and Germany’s national railway company, The Deutsche Bahn.

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End-to-end encryption is a huge selling point for the big technology companies of today, one that WhatsApp hollers from the rooftops. But making this work between different platforms built by different companies is not exactly easy, and many — if not most — experts on the subject say that it’s not possible to enforce a truly secure, interoperable messaging infrastructure that doesn’t compromise encryption in some way.

WhatsApp can control — and therefore promise — end-to-end encryption on its own platform. But if billions of messages are flying between WhatsApp and countless other applications run by other companies, WhatsApp can’t really know what’s happening to these messages once they leave WhatsApp.

[...]

There’s no escaping the fact that breaking encryption is far from ideal, irrespective of how a solution proposes to reconcile this. But perhaps more importantly, a robust solution for addressing the real encryption issues introduced by enforced interoperability doesn’t truly exist yet.

Despite that, Hodgson has said in the past that the upsides of the new EU regulations are greater than the downsides.

“On balance, we think that the benefits of mandating open APIs outweigh the risks that someone is going to run a vulnerable large-scale bridge and undermine everyone’s E2EE,” he wrote in May. “It’s better to have the option to be able to get at your data in the first place than be held hostage in a walled garden.”

[...]

In many ways, the ground has never been so fertile for Matrix to flourish: it’s in the right place at the right time, as the world seeks an exit route from Big Tech’s clutches backed by at least a little regulation.