Bluesky is decentralized, its just decentralized in a different way than Fediverse apps. People dont understand it and just say its fake decentralization rather than researching it.

There is already alternative infrastructure available (i.e. Blacksky) and a variety of other applications hosted using ATProto (you can see a few here: https://bsky.social/about).

You can use any of these apps while maintaining full control of your own data by running your own PDS, or using any community maintained PDS. If you already have an account on the Bluesky PDS, you can migrate it, retaining all of your data. If you dont feel like migrating yet, you can also just export your rotation key, which would allow you to maintain control of your account even in the event that the Bluesky PDS does become evil or something.