Nobody builds a centralized app and then successfully decentralizes it. Nobody. If you want a decentralized network, you build a decentralized network - and then centralize it to the minimum degree necessary for it to actually work and scale.
That's exactly what they've done. Bluesky is a decentralised service. It was designed to be decentralised. It's currently centralised in a limited capacity because they didn't open up federation right away.
First they allowed DID federation (i.e. you can host your own DID by tying it to your domain name). Then feed curation. Then data storage. Then moderation features. And so on. There's really only a few things left and those are systems that are designed in a decentralised manner but for the sake of a smooth transition have yet to be handed over fully to the community.
Would you say activity on the web is getting more or less centralized? I wonder what the general public even perceives as “on the web” versus eg “a post on instagram”
Email is distributed but either you pay Google/Microsoft to host it for you or you host it somewhere else..that carefully and proactively follows their rules.
The rest is PR.