Bluesky:

• Protocol is maintained by the same people who make the app and is developed on GitHub.
• Instance that was the only one for such amount of time is hosted on Amazon AWS, with domain bought on Google Domains. Does not support IPv6.
• Mobile app is not distributed on any of the open app stores, just Google Play and Apple AppStore.
• Weak non-copyleft license not protecting the software from turning closed source and not making users sure they actually use open source version.

Wow, such decentralization.