Atproto gives users choice for where their data is hosted as well as the ability to migrate their data to a new host. Users who dont want to put trust in a provider can host it themselves. How is that not an improvement over being locked in to a single centralized provider?

If you assume that Bluesky won't suddenly turn hostile (we'll get some warning) then being able to migrate your PDS is better than what X gives you and about the same as being able to move your git repo off of GitHub.