Bluesky is Decentralized, people are moving to Bluesky because it is easier to use and has better UI and UX. The reason people are moving to Bluesky and not mastodon has nothing to do with Decentralized, it is because it is simply user friendly. I used both and I think currently that Bluesky is definitely better. One of the biggest issues is the app, many users use their phones and The mastadon apps are awful in comparison to bluesky.

https://www.hostinger.com/tutorials/how-to-host-a-bluesky-pds

Bluesky uses AT Protocol and Mastodon uses ActivityPub which makes it impossible to federate. Bluesky does allow you to host your own servers though, so you can consider its own fediverse.

Use Redlib front end should be able to open reddit. Some instances don’t work, but you there are many that work. I use this extension: https://github.com/libredirect/browser_extension