bluesky is technically decentralized, but the way it does it makes self-hosting all but impossible due to storage requirements. because of that, it really isnt. its like how a lot of ai models are 'open-source' even though the training data isnt available and the ai is still effectively a black box. it isnt decentralized unless anyone can make an instance, just like how it isnt open-source unless you have access to everything that makes it work (yes, by this definition chromium and android aren't truly open-source, and I stand by that).