Comment by OneDeuxTriSeiGo

I don't really think that's fair.

Mastodon started as an alternative software stack for GNU/Social (and Laconica before it) years before ActivityPub even existed. It was created in an already almost decade old community/ecosystem and was competing against a PHP tech stack that was showing its age (which is why Mastodon was created).

Comparatively Bluesky/ATproto was a greenfield project with no pre-existing protocol or community to integrate with. And architecture-wise atproto within like 6 months of their 1.0 release federated/decentralised really really well. Bluesky less so (as it's mainly the appview that is limiting).

Even then though bluesky still works pretty well in a decentralised/federated context if you compare the scale it's operating at relative to mastodon and co back when they were of similar project age. Like the appview architecture at a high level works well but it breaks down once you are at a scale of tens of millions of users. And it'll only take relatively minor tweaks to the internal architecture of the bluesky appview to remove this scaling limitation.

Sorry for the rant but point being the ATproto is doing pretty well decentralisation wise for being ~3 years old and accommodating the sudden explosion of non-technical users on the platform so early in its life.