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Sup is a New Messaging App by the Creator of Pixelfed
(wedistribute.org)
This magazine is dedicated to discussions on the federated social networking ecosystem, which includes decentralized and open-source social media platforms. Whether you are a user, developer, or simply interested in the concept of decentralized social media, this is the place for you. Here you can share your knowledge, ask questions, and engage in discussions on topics such as the benefits and challenges of decentralized social media, new and existing federated platforms, and more. From the latest developments and trends to ethical considerations and the future of federated social media, this category covers a wide range of topics related to the Fediverse.
You won't get interoperability without people creating these kinds of apps. There's no reason Company A would futureproof their platform to communicate with apps that don't exist, because that's unnecessary development; the interoperability comes after the platforms exist. Email is a prime example of this.
So, I disagree that it's pointless.