@PaulaToThePeople
According to these people -
https://hackernoon.com/bluesky-and-the-at-protocol-decentralized-social-media-that-works
Mastodon, or ActivityPub Protocol
However, decentralization also introduces new challenges. For example, in the case of Mastodon, a user needs to choose a server when creating an account. This choice is significant because the server name becomes part of the username; migrating to another server implies changing username, and preserving one’s followers during such a migration requires the cooperation of the old server. If a server is shut down without warning, accounts on that server cannot be recovered – a particular risk with volunteer-run servers. In principle, a user can host their own server, but only a small fraction of social media users have both the technical skills and the inclination to do so.
The distinction between servers in Mastodon introduces complexity for users that does not exist in centralized services. For example, a user viewing a thread of replies in the web interface of one server may see a different set of replies compared to viewing the same thread on another server, because a server only shows those replies that it knows about [2]. As another example, when viewing the web profile of an account on another server, clicking the “follow” button does not simply follow that account; instead, the user needs to enter the hostname of their own server and be redirected to a URL on their home server before they can follow the account. In our opinion, it is undesirable to burden users with such complexity arising from the federated architecture.
Bluesky, or AT Protocol
The AT Protocol is designed such that for every part of the system there are multiple competing operators providing interoperable services, making it easy to switch from one provider to another.
Decentralization alone is not able to solve some of the thorniest problems of social media, such as misinformation, harassment, and hate speech [46]. However, by opening up the internals of a service to contributors who are not employees of a particular company, decentralization can enable a marketplace of approaches to these problems [38]. For example, Bluesky allows anybody to run moderation services that make subjective decisions of selecting desirable content or flagging undesirable content, and users can choose which moderation services they want to subscribe to. Moderation services are decoupled from hosting providers, making it easy for users to switch moderation services until they find ones that match their preferences. Our hope is that this architectural openness enables communities to develop their own approaches to managing problematic content, independently of what any particular service operator implements [38].
Atmosphere Protocol
https://atproto.com/
That protocol seems to be the open source part.
https://docs.bsky.app/blog/self-host-federation
Up until now, every user on the network used a Bluesky PDS (Personal Data Server) to host their data. We’ve already federated our own data hosting on the backend, both to help operationally scale our service, and to prove out the technical underpinnings of an openly federated network. But today we’re opening up federation for anyone else to begin connecting with the network.
Bluesky, the company, is a Public Benefit Corporation. It is owned by Jay Graber and the Bluesky team. The board consists of Jay Graber; Jeremie Miller, the inventor of Jabber/XMPP; Mike Masnick; and Kinjal Shah.
https://bsky.social › about › faq
Not sure if that is really any consolation or guarantee of future service and service agreements.
I suspect the game plan is enterprises and organisation would host and federate their AT Protocol perhaps with their own deployment of Bluesky PDS servers. Guessing these are VMs or "containers" to be hosted on prem or in cloud provider?
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