Comment by mdasen

> Working outside of did:plc is a choice

What you're saying is: working outside of centralization is a choice. did:plc is a centralized database controlled by Bluesky.

Bluesky talks a big game about decentralization when it's extremely centralized. Everyone uses the centralized did:plc because it's the one way to really make it function. Until very recently, everyone used the centralized Bluesky AppView - and even now, well over 99% do. Bluesky will say things like "the protocol is locked open", but Bluesky could decide to shut off their firehose at anytime (leaving third parties cut off) and could decide to stop taking incoming data from third parties (leaving anyone on non-Bluesky servers cut off from basically everyone).

In a lot of ways, Bluesky is more like Twitter a decade or so ago. It offers APIs that third parties can use to build off of - but at any time, Bluesky could shut down those APIs. Back then, you could read the Twitter firehose and store the tweets and create your own app view with your own front-end if you wanted. Tweets would need to be sent to the Twitter APIs, but that's not really different than your third-party PDS server sending them to Bluesky if you want anyone else to read them.

You aren't open if someone controls the vast majority of a system because at any time they can decide "why are we doing this open thing? we could probably force the <1% of people elsewhere to migrate to our service if we cut off interoperability." Google Talk (GChat) offered XMPP federation and a lot of people bought into the platform because it was open. At some point, Google realized that the promise of openness had served its purpose and closed it off.

And it's important to think about the long-run here. Twitter was that benevolent dictator for a long time. Bluesky is still early and looking to grow - when they want people building off their system, giving them engagement, ideas, and designs they can copy. We're around year-5 of Bluesky. A decade from now after Bluesky builds its popularity on the back of "we're open and decentralized" while making decentralization extremely difficult, will that change? If Bluesky gets to a few hundred million users and then a third party starts looking like a potential threat, maybe they'll cut that off before they have genuine competition.

Maybe that won't happen with Bluesky. Maybe their investors won't care about the potential for a pay day. But if they have control (either through centralization like did:plc or by controlling the vast majority of the network), there will always be the potential for them to break interoperability. If they start monetizing Bluesky, why should they keep hosting, processing, and serving all that data for third party clients they can't monetize? Why shouldn't they stop federating with third parties before a third party becomes competition?