my personal dislike for it is that the claims of decentralization are countered by how expensive it is to operate in a truly decentralized manner.

To be truly decentralized you would need to run a relay server, not just a PDS which many people already do and simply holds your data. Unfortunately, the cost to run a relay server today is already about $500+ a month [1] and will only be getting more expensive.

Lastly, while the fediverse has figured out decentralized DM’s, Bluesky DM’s are completely centralized [1] and only work thanks to being funneled through their servers. I wouldn’t call what they have private considering they can read what everyone on Bluesky is saying privately. Granted, fediverse DM’s are not encrypted either, but at least they’re decentralized and don’t allow a single provider access to everyone’s private messages.

[1] https://dustycloud.org/blog/how-decentralized-is-bluesky/