The credible exit allows for real competition. In other words you can own your identity and data, apps store content in your database, and you can swap out apps that enshittify, eg. there are many alternative clients for bluesky data.
The design of feeds (algos) and labellers (moderation) is unique and one of the best parts of the protocol.
There are also interesting applications for inter-app features, a double edged sword, i.e. good for content creators but bad for something like linkedin.
> The credible exit allows for real competition
This is a mirage. The ATProto providers don't give you the cryptographic keys to your identity, so if they lock down your account, you can't migrate.