Blue Sky is a for-profit corporation. How do they plan to make money?
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They use domain names for handles, they do have a partnership with one registrar for integration for users who want custom domains for handles (commission model). Other than that, to be seen.
Who controls access to the network?
Once full federation is live, nobody. Anybody could create a relay server (BGS, shared cache server like a CDN), and anybody can run a PDS (account hosting server).
3rd parties already run feeds on their own servers and 3rd party clients exists, and the sandbox network for federation testing has 3rd party PDS servers too.
For user account lookups, if you use the web-DID type then you’re not dependent on bluesky servers at all.
Account portability and the ability to mix and match services and switch quickly are the biggest enshittification protection mechanisms. You can’t really lock in users in this model. You can’t even prevent users from ditching your PDS account host if they kept a backup of their data and held their own keys.