“Why did the #TwitterMigration fail?” https://blog.bloonface.com/2023/06/12/why-did-the-twittermigration-fail/
On similar lines: “Bluesky Has Problems” https://nucleardiner.wordpress.com/2023/06/12/bluesky-has-problems/
I suspect Twitter will sort itself out before any of these others things manage to take off.
This seems interesting: https://blockprotocol.org/wordpress (Background: https://www.joelonsoftware.com/2022/12/19/progress-on-the-block-protocol/)