Yes accounts are distributed to each server. Same as communities.

You’ll need to be able to ssh into the server.

Hosting a single user instance, I’m seeing a few GB of network traffic over the past few days and maybe 10Gb at most needed for the disk.

For others: https://www.theverge.com/2023/6/9/23755640/reddit-api-changes-apps-apollo-shut-down-ama-spez-steve-huffman

One of the downsides seems like since the developer packages everything together, I’m reliant on them to push out changes. For example if some dependency needs a critical security update then I’m relying on every flatpak author to apply that change and push out a new version. But if I’m installing packages directly, I can update that one package and be done with it across my system.